enervent Fenix 120, Installation And Operation Instructions Manual, Page: 7 / 31

7
Silencers. A silencer 900 mm long is recommended for the exhaust duct, a silencer 600 or
900mm long is recommended for the supply air duct.
Distances between waste air and fresh air openings. Usually fresh air is taken from a
north facing wall and the waste air is led out from the roof or opposite wall.
Other methods are acceptable, so long as they fall within the guidelines laid out by the
Building Regulations (Example: D2: Finland 2003, extract shown below), or in accordance
with your local directives and regulations governing indoor climate and building ventilation.
The diagram shows how to determine the distance between the outside feed into the
house and the waste from the house.
Waste air - fresh air feed,
in the horizontal plane.
Waste air above
the fresh air feed,
in the vertical plane.
Waste air below
the fresh air feed,
in the vertical plane.
Measurements are in meters
2 4 6 8 10 12 14 16 18 20
cl 1 and 2
cl 3
cl 3
cl 4 under 0,3m
³/
s
cl 2
cl 4 under 1,5m³/s cl 4 under 3,0m³/s cl 4 under 6,0m³/s
2
4
6
8
10
12
2
4
6
cl 4 under 0,3m
³/
s
cl 4 under 1,5m³/s cl 4 under 3,0m³/s
cl 4 under 6,0m³/s