Wall Mounted AirMaster Heat Recovery Ventilation Units

Great care has been taken with the casings of AirMaster units. Any exposed panels are of streamlined design so as to fit in discreetly with ceiling lines.

Wall mounted units are available in 4 sizes, with ratings and usage as follows:

AirMaster AM 100airmaster-am300-wall-mounted

100 m³/hr with 35 dB(A) @ 1m,
or 75 m³/hr with 30 dB(A) @ 1m.

The AM 100 is the smallest unit of the AirMaster decentralized heat recovery ventilation range. This heat recovery ventilation unit is well suited to individual offices. It can be be partly recessed in the ceiling void (as shown on right), reducing visual impact to the minimum.

AirMaster AM 300

300 m³/hr with 35 dB(A) @ 1m,
or 240 m³/hr with 30 dB(A) @ 1m.

This decentralised heat recovery ventilation unit is a useful choice when designing for partitioned spaces with higher ACH (air changes per hour), such as medical treatment and consulting rooms, offices and smaller meeting rooms. With normal office conditions, it would be good for up to 10 people. For those applications involving internal offices away from external walls, all units larger than AM 100 in the AM range can provide ventilation using duct runs of up to 10m.


AirMaster AM 500

550 m³/hr with 35 dB(A) @ 1m,
or 450 m³/hr with 30 dB(A) @ 1m.

Catering for up to 20 people, this heat recovery unit is an efficient ventilation solution for medium sized rooms, such as offices, conference rooms and smaller classrooms.


am-800-adjustedAirMaster AM 800

725 m³/hr with 35 dB(A) @ 1m,
or 650 m³/hr with 30 dB(A) @ 1m.

A great application for this air handling unit is for offices, meeting rooms, classrooms of 30 (pupils & staff) and 60 m² floor area. Modulating control of  CO2 concentration to a desired value of say, 1,000 ppm means that the learning environment can be optimised.

For rooms with suspended ceilings, AirMaster units can be embedded 1/3 or 2/3 in the void space. With each of the variants, the unit internals are reconfigured so as to always keep the supply air grille next to the ceiling surface. This allows the Coanda air distribution effect to be maximised.

Duct connections – further options

Further options are available in terms of duct connections, which can be made at the back (for passing through the wall) or at the top (for passing through the ceiling). Details are shown below:



Conceals up to 2/3 of the unit in the ceiling. It can be supplied complete with air intake and exhaust through the wall or the roof. The integrated model can be mounted on a wall or ceiling.

This option is not available for AM 100[ML1] .



The air intake and air exhaust are run directly outside through the wall on which the unit is mounted. The outside wall is finished off with louvered gratings.



Mounted like the wall model on a wall in the room, but the air intake and air exhaust are run upwards through the roof. It is finished off on the outside with roof caps and flashings.


Successful operation of wall mounted units

Successful operation of wall mounted direct ventilation air handling units is dependent on keeping a smooth, even ceiling surface over the air throw area. Throw distance varies between 5m for the AM 100 and 7m for the AM 800.

As the diagram below shows, the AirMaster heat recovery ventilation units distribute the supply air to different degrees, depending on the given airflow. The blue tones on the illustration show the airflow at different throws.


It is important to avoid obstructions to air flow from structural beams or light fittings. Where lighting provision exists, the use of recessed or pendant fittings would prevent any restriction to the Coanda effect.

For rooms with sloping ceilings, wall mounted air handling units must be placed as high as possible. The Coanda effect still holds good even though the throw area is inclined.

Advice on the sizing and positioning of direct ventilation units is part of SAV Systems’ effort to ensure that every AirMaster air handling unit delivers outstanding performance. We are used to dealing with project layout drawings at all stages, and are happy to become involved whether at project feasibility, initial design, tender or construction.

Document Downloads

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  • 1. AirMaster Brochure
  • 2. AirMaster Technical Data

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