Compact Air
Contents
1. C function Step 1 indicates a supply air temperature of 18 8 and Step 3 indicates However the term extract air temperature is in fact more 21 correct 149 We reserve the right to alter specifications 20060501 www swegon com Compact Air Description of the Control System Special Functions Airing Out the Compact Air unit is equipped with an airing out func tion The function causes the unit to operate at maxi mal airflow supplying air at reduced temperature for 15 minutes The function can be manually selected in the control display If the unit is controlled by an occupant detection sensor the automatic airing function can be selected Automatic airing out is conditional on the unit having supplied normal airflow for at least 10 minutes i e the occupant detection sensor has registered the presence of one or more occupants and after that not registered any presence for 5 minutes Summer Night Cooling The summer night cooling function is a simple method for supplying cool outdoor air to the room Within specific conditions and temperature limits the Compact Air unit automatically operates in the high speed mode The function can be manually selected in the control display Limiting the Supply Air Temperature If the heating system in the building is shut down or is set to substantially reduce night time heating a setting for limiting the supply air temperature can be preset to avoid chilling the rooms2. 1 07 Infill piece upper section The dimensions of the bench top itself are slightly larger than those specified above Dimensions of the opening for a separate lower unit sec tion in a wall Height 880 mm width 1120 mm R a 1110 7 Lo m N m Bench top IL Perstorp 5050 550 A Thickness 29 mm 1090 The infill piece consists of three parts 1 long side and 2 end plates that have to be assembled together 156 We reserve the right to alter specifications 20060501 www swegon com Compact Air diy pedwoy 157 We reserve the right to alter specifications 20060501 www swegon com Compact Air 158 We reserve the right to alter specifications 20060501 www swegon com Compact Air diy pedwoy 159 We reserve the right to alter specifications 20060501 www swegon com Compact Air 160 We reserve the right to alter specifications 20060501 www swegon com
3. Separate lower unit section Air distribution plate Compact Air Room Unit Registered design Registered trademark Replacement Material Filter 1 pc F85 EU7 Specification Compact Air Room Unit CACA 2 aa bb Extra Accessories Size 08 11 J Occupant Detection Sensor CACZ 1 01 Language variant in the display Electric air heater 1 kW CACZ 1 02 Swedish Exterior Wall Hood CACZ 1 03 Norwegian One week timer CACZ 1 05 a 2 Extract Air Connection Piece CACZ 1 06 English Unit to ceiling infill piece CACZ 1 07 Separate lower unit section CACZ 1 08 English Air Distribution Plate CACZ 1 10 a German 22 Variant 1 2 3 4 French Replacement Material Filter 1 pc F85 EU7 CACZ 1 04 7 146 We reserve the right to alter specifications 20060501 www swegon com Compact Air Description of the air handling unit Operation The Compact Air room unit is a complete air handling unit designed for supplying air according to the displacement ventilation principle Outdoor air is supplied via a duct to the unit where it passes through the filter the built in silencer and the electric air heater if fitted After that the air passes through the built in silencer and is discharged via the low velocity air diffuser into the room In that the supply air has a slightly lower temperature than the room air the room air is pressed upward toward the ceiling The Compact Air then sucks in extract air via an intake at
4. This limit setting has effect regardless of whichever airflow control options and other temperature limits have been preset Keep in mind that ventilation performance may be below normal when this function is activated It should be pointed out that the unit does not have ca pacity for heating the room it serves it solely ventilates it See also the coming subsections about Reduced Night time Temperature under Sizing the Heating System under the section Installation Tips 150 We reserve the right to alter specifications 20060501 Duct Pressure Drop Calibration The pressure drop in the ducting is calibrated when the unit is commissioned The results of this calibration are stored as fundamental information about the conditions that existed when the unit was initially started up and are used as a basis for subsequent filters tests described below Filter Test Every time the unit is controlled from normal airflow to the low airflow mode an automatic filter test is conduct ed As the filters become fouled the pressure drop across them increases By comparing the initial conditions with current conditions the controller can indicate when it is time to change the filters When the pressure drop exceeds the alarm limit an alarm appears in the control display Automatic Fan Speed Adjustment The Compact Air unit has a self adjusting fan speed fea ture for maintaining the preset airflow rate A pressure rise in the syst
5. is well suited for rooms that are regularly in use The desired times for switching between the low flow and normal flow modes can be individually preset for vari ous days of the week Occupant Detection Sensor The one week timer is well suited for rooms that are regularly in use If the occupant detection sensor is used the unit oper ates in the low flow mode as long as the sensor does not register any occupant in the room As soon as it registers an occupant the unit is switched over to the normal flow mode The automatic airing function can also be preset in con junction with the use of an occupant detection sensor 148 We reserve the right to alter specifications 20060501 COMPACT AIR 2 11 NORMAL OPER FAIRGE Nip v timer ROOMTEMP ROOM CTRL MIN 16 C SUMMER NIGHT COOL ME 4 un SA 22 C SET The control display and two typical menus One week www swegon com Compact Air Description of the Control System Temperature Control Control Sequence When heating is required the controller first increases the speed of the rotary heat exchanger Then it switches in the electric air heater if fitted to generate heat If no electric air heater is installed or if the heater s output is insufficient the controller slightly decreases the speed of the supply air fan to achieve the correct temperature ERS Control The Compact Air unit employs ERS Control extract air
6. open the adjacent room will also be ventilated due to the displacing air supply 153 www swegon com Compact Air Installation Tips Typical Simple Installation for One Room To achieve optimal operating economy it is important to design the duct system with as low pressure drop as pos Ay v4 v4 sible Therefore the designer should strive to arrange ducts that are as short as possible and avoid including more duct gt bends than are necessary The duct connections on the Compact Air unit are arranged to enable ducts to be run ae in any direction without blocking one another The design of the hoods grilles etc for outdoor air ex haust air are also important The special design of the exterior wall hood for the Compact Air unit minimizes pressure losses The illustration to the right shows typical Compact Air unit locations in a room Alternative locations of the Compact Air unit in a room The runs of ducting will be the simplest and shortest if the room unit is located against a periphery wall Installation Examples for Supply Air Extract Air in Several Rooms The Compact Air unit can also supply and or extract air to from more than one room Ventilation professionals should be engaged for the planning and installation of all such ventilation systems a The Compact Air unit can supply air to several rooms via door slots transfer air grilles or the separate lower unit section accessory Extract air can a
7. temperature related supply air temperature control This involves controlling the supply air temperature relatively to the extract air temperature This type of temperature control offers optimal operating economy and heat recovery and makes it possible to do without any reheating coil Compact Air offers two options for controlling the supply air temperature Either according to Alternative 1 that involves following the extract air temperature or accord ing to Alternative 2 that involves maintaining the desired room temperature if the extract air temperature is high Alternative 1 Supply Air Temperature The supply air temperature is controlled in relation to the extract air temperature Control can be carried out ac cording to three alternative steps Step 1 provides the best operating economy and cool ing power in warm rooms whereas Steps 2 and 3 may be of special interest in day nurseries where children often spend time at floor level The difference between the three steps is illustrated in the following chart 24 23 22 21 20 19 18 17 16 15 Supply air temperature C 14 15 1617 18 19 2021 22 23 24 25 26 27 28 2930 31 32 Extract air temperature C The blue broken line shows the difference between Steps 1 and 3 at a Alternative 2 Room temperature If control of the supply air temperature as described above does not provide adequ
8. Compact Air Swegon Room unit Contents diy pedwoy Technical Description of the Air Handling Unit General Specification vedk ond 146 Function Functional SECTIONS vac cidcniiicinuescenecenessusnnsneiacbdeteecesnmuscutenead saveseanenonauexteieeke 147 Control System Control Display Airflow Control rusnnnvnnnnnnnrnnnnnnrrnnnnnnnnvnnnnnnnvnnnnnnnrnennnnrnnennennnne 148 Temperature Control cccssccccsssescasssceccesssssnsnaseccavesnsnenascuassacasaccscessansaasisscineneasannnds 149 Special FUNCTIONS sasscacssccsnsesacsnasaanasnssiacsgriasnsnaataaseetoorscantadassenecacasseniadsaceacniatiencasacas 150 Accessories One week Timer Occupant Detection Sensor Electric Air Heater Exterior Wall Hood Unit to ceiling Infill Piece snnnnnnnnnnnvvvrvvrnnnnnnnnnvnernnnnnnnnnnnn 151 Separate Lower Section Air Distribution Plate Extract Air Connection Piece 152 Installation Tips General Information about Temperature Control mamrnrnnnsnnnrnnnnnnnrnnnnnnvrnnnnennnne 153 Typical Installation in One or Several ROOMS rrnnnvrnnnnnnrnnnnnnnrnnnnnnvrnnnnerrrnnnnennnennnn 154 Sizing Airflows and Acoustic Data rrrnrnnnnnnnnvnnnnnnnnrnnnnnnrnnnrnnnrnnnnnnrrnnnnennvennnennnrensrnnrrnenennn 155 Dimensions and Meghk uessemsensnassememmeens eeemseesests some 156 145 We reserve the right to alter specifications 20060501 www swegon com Compact Air Swegon Description of th
9. are applicable to the reverberant field in normal rooms where people congregate The difference between the sound power level and the sound pressure level L L 12 dB If the extract air connection piece is used sound pressure levels other than the ones tabu lated may arise Outdoors The sound pressure levels tabulated above are applicable to 8 dB at a distance of 10 m from the exterior wall hood The dif ference between the sound power level and the sound pressure level L L 25 dB 155 www swegon com 1y peduwo Compact Air Dimensions and Weights Compact Air CACZ 1 03 Exterior wall hood TT eee 1230 The upper section and lower section can be split to make transport within the site easier P The provisions for extract air outdoor air 765 can be reversed at the installation site 2088 CACZ 1 06 Extract air connection piece 18 656 Overall weight 300 kg Upper section 185 kg lower section 115 kg 1100 mm free space is required for opening the front panel left hand hung 1090 EE EE The sketch shows that the extract air connection piece with 90 bends does not add more to the installa tion height than do the 90 bends for the unit s spiral connections 780 Separate Lower Unit Section with Bench Top ae Dimensions and weights according to the above without CACZ
10. ate cooling power control of the room temperature can be selected as an alternative In this mode the supply air temperature will instead be controlled and the unit will then attempt to maintain a specific room temperature with the following reserva tions 1 The temperature of the air supplied from the Compact Air unit will never be higher than the room temperature 2 The temperature of the air supplied from the Compact Air unit will never by lower than that of the outdoor air 3 The desired room temperature can be programmed in 1 C increments within the interval of 19 24 C The lowest permissible supply air temperature can be programmed in 1 C increments within the interval of 15 19 C This minimum permissible supply air temperature setting has desired effect only when the room tempera ture is within the interval of 19 24 C diy peduwo 25 24 23 22 21 Progr room temp 19 24 C Supply air temperature C N 145 161718 192021 22 23 24 25 2627 28 2930 31 32 Extract air temperature C The blue broken line shows how the supply air temperature varies depending on the extract air temperature if the preset room tempera ture is 21 C and the lowest permissible supply air temperature is 16 C The term room temperature is used in this connection to make it easier for the user to understand the control given extract air temperature 32
11. e air handling unit General The Compact Air room unit is a complete air handling unit with supply air and extract air fans Supply air and extract air filters rotary heat exchanger silencer and built in low velocity air diffuser The control equipment is also inte grated into the unit The Compact Air unit is well suited for use in classrooms day nurseries conference halls offices workrooms shops restaurants and similar public premises Compact Air is available in two capacity variants The size 08 Compact Air units are designed for ventilating normal classrooms and comparable rooms The size 11 Compact Air units are designed for ventilating larger rooms and or more than one room The unit should be installed in the room to be ventilated and is connected to the mains by means of an electric plug to an earthed electric socket The ducts for outdoor air and exhaust air should be connected to the top of the unit and should be arranged to lead out through the periphery wall The unit is automatically controlled between normal airflow and low airflow by the timer or occupant detec tion sensor accessories The performance of the unit can be checked and temporary changes can be entered via an control display on the front of the unit The unit has a beige painted finish Extra Accessories Occupant detection sensor El air heater 1 kW Exte rior wall hood One week timer Extract air connection Unit to ceiling infill piece
12. e viewed here and the display is also used for viewing alarms and tracing faults The preset values are then stored in a type of memory that is unaffected by power failures The Compact Air unit can also be manually controlled via the control display Settings All the airflow temperature and other settings can be entered in the control display in conjunction with commissioning the unit Use The control display shows the current operating situation in plain text To alter any of the preset values press the appropriate keys to advance to the various menus where new values can be entered Scope is available for entering temporary manual changes If it is desirable to temporarily change the airflow simply press the keys for or to decrease or increase the airflow It is also possible to request the airing mode max airflow and reduced supply air temperature for 15 min All the manually entered changes return to the automatic operat ing settings after a specific period This feature corrects forgotten settings or entries made out of pure mischief Alarms and Fault Tracing Alarm indications for necessary filter change and possible mal function are displayed in plain text These are accompanied by a flashing red warning LED Airflow Control Either a one week timer or an occupant detection sensor Occupant is used for switching between the normal flow and low Detection flow modes Sensor One week timer The one week timer
13. em caused by fouled filters for instance is therefore automatically compensated to always achieve the preset airflow Alarms Besides alarms for necessary filter change alarms for pos sible malfunctions are also indicated Alarms are indicated in the control display by a flashing red LED and by a malfunction message in plain text Group alarms can be connected to a central alarm station The three most recent alarms are stored in the memory of the controller www swegon com Compact Air Description of the Accessories Accessories for Simple Installation One week timer The one week timer is well suited for rooms that are regularly in use The one week timer is a switching clock used for control ling the Compact Air unit between the normal airflow and low airflow modes individually for various days of the week The timer should be wired to ready to use 12 V power supply terminals on the top of the air handling unit See also previous section Airflow Control Occupant Detection Sensor The occupant detection sensor is well suited for use in rooms that are not regularly occupied The occupant detection sensor is a type of motion detec tor that senses infrared light The unit operates at low airflow as long as the sensor does not register presence inside the room As soon as it registers an occupant the unit is switched over to the normal flow mode When the room is unoccupied again the unit returns after a sligh
14. han 140 Pa Size 11 Airflow m h 700 800 900 1000 1100 Available pressure Pa Airflow l s Example broken line If an aiflow of 250 I s 900 m h is desirable the pressure drop in con nected ducts and diffusers for instance must be no more than 90 Pa Comfort boundary Airflow room temperature and supply air temperature influence the comfort boundary of the unit how close can an occupant be without feeling a draught The veloc ity of the air discharged from the diffuser section of the Compact Air unit is very uniform and the normal comfort boundary from the face of the diffuser is approx 1 metre We reserve the right to alter specifications 20060501 Sound The tables below show the sound pressure level for vari ous airflows and pressures A normal installation with short outdoor air and exhaust air ducts and an exterior wall hood generate a noise value as specified in the 0 20 Pa column in the table The columns that contain a dash are irrelevant Size 08 Sound pressure level in dB A Static pressure Pa 60 100 140 31 33 Normal installation 0 20 Airflow I s m3 h 222 800 195 700 167 600 140 500 Size 11 Sound pressure level in dB A Static pressure Pa Airflow Normal I s m h 6 installation 0 100 140 305 1100 34 250 900 30 32 34 195 700 26 28 30 32 0 20 Indoors The sound pressure levels tabulated above
15. he Compact Air unit automatically and variably reduces the supply airflow This provides the heat exchanger with surplus heat from the extract air ena bling it to serve its purpose Sizing the Heating System The supply of air at a temperature slightly below room temperature presupposes that there is surplus heat in the room being ventilated If this is not the case no heat ing load in the room at night for instance the heating system of the room must be sized so that its output will compensate the below room temperature air supplied to the room If no reheater is installed sizing presetting the ordinary heating system of the premises must take into account the fact that the Compact Air unit will supply air at a reduced airflow rate during periods of extremely cold weather The outdoor air that at low outdoor tempera tures seeps in through leakage sources such as windows and doors must be heated by the ordinary heating sys tem of the premises Reduced Night time Temperature For optimal operating economy the Compact Air unit should be operated in the low fan speed mode when the room is not used e g at night and during weekends and holidays Even during these periods the Compact Air unit will operate with air cooler than room temperature If the heating system of the building is programmed to operate at a lower temperature setting at night the air supplied by the Compact Air unit will still be a few degrees cooler than the ex
16. lso be taken from other spaces conveyed through ducts and the extract air connection piece acces sory The unit supplies air to several rooms via doors with an air slot at the bottom Extract air from adjacent rooms is conveyed to the unit via extract air devices and ducts and in the extract air connection piece accessory v4 For particulars of the extract air intake and transfer air see also Installation Tips on the previous page The unit supplies air to several rooms via transfer air grilles Extract air The unit supplies air to two rooms via the separate lower unit section from adjacent rooms is conveyed to the unit via extract air devices and accessory Extract air from adjacent rooms is conveyed to the unit via ducts and in the extract air connection piece accessory extract air devices and ducts and in the extract air connection piece accessory 154 We reserve the right to alter specifications 20060501 www swegon com Compact Air Sizing Capacity Airflows The chart shows available pressure over and above that of the normal installation short outdoor air and exhaust air ducts each with its own 90 bend and both sharing a common exterior wall hood Size 08 Airflow m h 400 500 600 700 800 Available pressure Pa Airflow l s Example broken line If an aiflow of 167 I s 600 m h is desirable the pressure drop in con nected ducts and diffusers for instance must be no more t
17. m thick If a separate lower unit section is used two adjacent rooms can be ventilated by means of displacement ventilation Air Distribution Plate The air distribution plate accessory makes it possible to control the distribution of air if a separate lower unit section is used The air distribution plate is a perforated galvanized sheet steel plate that can be secured by screws either in the lower section of the unit or in the separate lower unit section The function of the air distribution plate is to throttle the flow of air discharged from the dif fuser in which it is fitted The plate is available with perforations in 4 different variants that distribute air at the airflow rates tabulated below Swegon Extract Air Additional Rooms Extract Air Connection Piece The extract air connection piece is used if it is desirable to ventilate other spaces than the room in which the Com pact Air unit is installed such as pantries offices or WCs The extract air connection piece is made of galvanized sheet steel It has four 125 mm dia circular duct connec tions for extract air from other rooms and a rectangular opening for extract air from the same room where the unit is installed The rectangular opening is adjustable enabling airflow adjustments 125 mm dia spiral insertio
18. n joints are required for con necting spiral ducts Spiral ducts or insertion joints are not included in the supply The connections that are not needed should be fitted with a cover WOU JE YXq Wd 11e UX3 Wd 112 UX3 WOAL 11 UX3 The plate can be pivo ted up and down for adjusting the air flow V 00 Total Airflow Variant 1 Variant 2 Variant 3 Variant 4 l s l s l s l s l s 277 177 100 211 66 229 48 241 36 222 144 78 172 50 183 39 191 31 167 104 63 127 40 133 34 145 22 152 We reserve the right to alter specifications 20060501 www swegon com Compact Air Installation Tips General Information about Temperature Control ERS Control The Compact Air unit controls the temperature of the supply air on the basis of the temperature of the extract air This type of control is called extract air temperature related supply air temperature control i e ERS Control Reheaters Can Be Left Out in Most Applications The temperature of the supply air discharged into the room is one or several degrees lower than the tempera ture of the air extracted from it This makes it possible to optimally utilise the heat exchanger Therefore in normal applications no reheating coil is needed This has a positive effect on total economy both in terms of installation and running costs If the performance of the heat exchanger still is not sufficient for keeping the supply air temperature up to expected level t
19. r specifications Supply ait fa fetes 20060501 Wall hood EXHAUST AIR OUT DOOR AIR diy pedwoy SUPPLY AIR Size 11 For normal airflow variable from 83 to 305 s 300 1 100 m3 h For low velocity airflow switched off or variable from 83 to 305 s 300 1 100 m3 h Filters The Compact Air unit is equipped with ample fine filters for both the supply air and the extract air The filters are disposable Class F85 EU7 filters are used Heat Recovery The rotary heat exchanger is of Reconomic type patented by Swegon Its temperature efficiency is 84 at an air flow rate of 167 l s size 08 and 83 at 250 I s size 11 The amount of heat required is controlled by automati cally regulating the heat exchanger s rotation speed Connection to Power Supply The unit is connected to the mains by means of an electric plug to an ordinary earthed single phase 10 A 230 V socket outlet without el air heater with el air heater Size Active power Current Active power Current W A W A 08 480 3 3 1480 hi 11 710 3 4 1710 7 8 147 www swegon com Compact Air Description of the Control System Control Display The Compact Air unit is equipped with an electronic control dis play positioned on the exterior of the unit s inspection door The control display is used for entering all the automatic control system settings The current operating situation can b
20. t delay to the low airflow mode The automatic airing function can also be preset in con junction with the use of an occupant detection sensor The timer should be wired to ready to use 12 V power supply terminals on the top of the air handling unit See also previous section Airflow Control Electric Air Heater The electric air heater is available as an accessory for special needs See also the coming section Installation Tips ERS Control The output of electric air heater is 1000 W The thermal overload protector is included The air heater is supplied loose for installation at the building site It should be lo cated at a specific spot between the heat exchanger and the supply air fan and be wired by means of its ready to use quick connector We reserve the right to alter specifications 20060501 Exterior Wall Hood The exterior wall hood is designed for the admission of outdoor air and the discharge of exhaust air The hood is made of galvanized sheet steel and has a black painted finish The exhaust air is horizontally discharged through a circular wire mesh grille at the front of the hood Outdoor air is admitted through a wire mesh grille at the bottom of the hood This design effectively prevents short circuit flow between the outdoor air exhaust air The exterior wall hood is equipped with 250 mm sleeve couplings fitted with a type approved rubber ring seal The connections can be reversed to fit
21. the top of the unit The air passes the silencer filter and heat exchanger and is then discharged via duct to the open air Casing The unit casing is of double skin design with 30 mm thick insulation sandwiched between sheet steel The visible parts of the unit are painted in a beige colour tone The air handling unit is mounted on base beams A base plate painted black is used to cover them The base plate is supplied in unmounted condi tion The inspection door is hung on hinges secured to the left hand edge The door can only be opened using a special key When the door is opened a switch interrupts the power supply to the fans and the heat exchanger Division into Sections The Compact Air unit is always supplied as one complete air handling unit If transporting the unit within the site proves difficult the unit can be split into an upper sec tion and a lower section The fans heat exchanger filters intermediate level and inspection door can also easily be dismantled from the upper section Airflows To provide the best operating economy the Compact Air unit is designed for supplying a normal airflow while the room is occupied and low velocity airflow whenever the room is unoccupied The airflows can be preset as follows Size 08 For normal airflow variable from 83 to 222 s 300 800 m3 h For low velocity airflow switched off or variable from 83 to 222 s 300 800 m h We reserve the right to alte
22. tract air the air in the building Consequently it is advisable to always keep in mind how the Compact Air unit operates before programming a reduced night time temperature setting in the ordinary heating system of the building We reserve the right to alter specifications 20060501 Extract Air Intake The purpose of ERS Control is supply air at a tempera ture that is one or more degrees lower than the extract air temperature i e a few degrees lower than the room temperature If the Compact Air unit is installed in such a way that ex tract air is also taken from another room with a different temperature the temperature of the supply air may cause short circuit airflows or give rise to draught problems The extract air sensor is mounted by the extract air intake on the top of the Compact Air unit Its exact location should be carefully considered if the extract air connec tion accessory is used Transfer Air Transfer air grilles or door slots to adjacent rooms have a strong influence on the system s performance Air transfer grilles positioned low cause unused air to be transferred to adjacent rooms and impair the ventila tion performance in the room where the unit is installed Air transfer grilles positioned high involve the risk that used air will be transferred to adjacent rooms Ventila tion is however not impaired in the room where the unit is installed diy peduwo Important If the doors are
23. various connection options This is easily done at the building site 1y pedwoy The outdoor air extract air can easily be reversed at the building site Unit to ceiling infill piece The unit to ceiling infill piece makes it possible to conceal the duct connections at the top of the air handling unit If the building has high ceilings several infill pieces can be fitted in a series upward The infill pieces consist of three sections end pieces long side to be assembled together The end pieces can not be used if the ducts extend out to the side The infill pieces are made of galvanized sheet steel painted in the same coulor as the Compact Air unit TT 151 www swegon com Compact Air Description of the Accessories Supply Air Additional Rooms Separate Lower Unit Section with Bench Top With the separate lower unit section accessory fitted the Compact Air unit can discharge supply air to two adjacent rooms The separate lower unit section is a complete lower sec tion for the Compact Air unit with heat exchanger supply air diffuser and base The airflow through the lower section of the unit is equivalent to the airflow through the separate lower sec tion The air distribution plate accessory can be used if different air distribution is desirable A bench top is supplied together with the separate lower unit section The bench top is beige and has a light pat tern type Perstorp 5050 The top is 29 m
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