AM 900

Airmaster AM 900 is a floor-standing ventilation unit suitable for larger rooms such as classrooms, meeting rooms and office landscapes where efficient, noise-free air replacement is needed.

AM 900 is a balanced decentralised ventilation unit with heat recovery, which is offered in two different versions for mixing and displacement ventilation. The different ventilation principles give the unit a high level of flexibility, and the model is chosen according to the layout and use of the room.

The unit can stand freely on the floor or discreetly between cabinets, as an integrated part of the room. Like all Airmaster units, the ventilation unit can be demand-controlled with a CO2 sensor, motion sensor (PIR), or hygrostat, for example. The unit can be supplied with a separate control panel but can also be connected to a central control.

Examples of applications

  • Offices
  • Meeting rooms
  • Institutions
  • Gyms and the like
Data AM 900


Filter class

30 dB(A)

35 dB(A)


Maximum capacity

ePM10 75%

ePM1 55%

ePM1 80%

690 m3/h

669 m3/h

649 m3/h

830 m3/h

805 m3/h

780 m3/h

Throw length (0,2 m/s)

6 m at 690 m3/h

7,2 m at 830 m3/h

Maximum capacity

ePM10 75%

ePM1 55%

ePM1 80%

650 m3/h

631 m3/h

611 m3/h

800 m3/h

776 m3/h

752 m3/h

Displacement ventilation

Adjacent zone (0,2 m/s)

Adjacent zone to outlet, approx. 1,2 m at 650 m³/h

Adjacent zone to outlet, approx. 1,5 m at 800 m³/h

Nominal current*

1,8 A

Nominal power consumption*

240 W

Electrical connection

1 x 230 V + N + PE / 50 Hz

Duct connections

Ø315 mm

Condensate drain

Ø4/6 mm


180 kg

Counterflow heat exchanger

3 x PET

Supply air filter

ePM10 75%, ePM1 55% or ePM1 80%

Extract air filter

ePM10 75%

Colour, casing

Ral 9010 (white)

Power cable

3 x 1,5 mm²

Recommended fuse

13 A

Leakage current

<– 6 mA

Dimensions (WxHxD)

Mixed: 800 x 2323 x 602 mm

Displ.: 800 x 2323 x 687 mm

Minimum ceiling height

2490 mm

* At filter class, supply air/extract air: ePM10 75% / ePM10 75%



Comfort heater

Heat output

1500 W

1050 W

Thermal circuit breaker, aut. reset



Thermal circuit breaker, man. reset




comfort heater

Max. operating temperature


Max. operating pressure

10 bar

Heat output

2345 W*

Connection dimension

1/2" (DN 15)

Materials pipes/fins


Open/close time, motor valve

60 s

* Capacity at: supply/return temperature 60/40°C, water volume 111 l/h

Standard and options

Standard and options

AM 900



Electric preheater

Electric comfort heater

Water comfort heater (mixing ventilation)

CO2 sensor (built-in)

Condensate pump

Motor driven exhaust air damper


Motor driven supply air damper


Capacitive return for motorised damper

Counterflow heat exchanger (PET)


Energy meter

x: standard : option

Throw length and adjacent zone

Throw length, mixed

Throw length illustrated for volume flow rate 830 m3/h. At other volume flow rates the throw can be extrapolated: L2 = L1 x q2 / q1.

The AM 900 unit spreads an air stream below the ceiling depending on the given flow rate. Blue shading in the illustration indicates spread pattern and throw.

1. Spread pattern seen from above, symmetric inlet (default).
2. Spread pattern seen from above, asymmetric inlet.
3. Spread pattern seen from the side.

Throw length and spread of the supply air in the room can be adjusted to the geometry of the room by adjusting the inlet opening with a pair of plyers (see operator's manual).

Notes regarding ceiling height
The AM 900 will fit into a room with minimum ceiling height of 2,49 m. The illustrated throw will manifest itself in these circumstances. The AM 900 will also work with larger ceiling heights, up to 4,50 m has been tested. Height above 2.50 m should be subtracted from the length of the throw.

Adjacent zone, displacement

The result applies to an undertemperature of the inlet air of 3-5°C.

AM 900 versions

Ready for a breath of fresh air

At Airmaster, we are “decentral” through and through. We are unrivalled when it comes to creating the best indoor climate and optimal well-being because we take each room and its occupants into account – and because we constantly strive to improve on what we do.

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