Domestic fans
Industrial and commercial fans
Single-room ventilation systems with heat recovery
Air handling units
Air heating systems
Smoke extraction and ventilation
Accessories for ventilating systems
Electrical accessories
Ventilation ducts and fittings
Air distribution components
Ventilation kits and vents
To reduce air pressure losses associated with air turbulence provide a straight air duct at the fan inlet and outlet. The minimum straight segment length must be at least 1 air duct diameter at inlet and 3 air duct diameters at outlet. No filters or other similar equipment is allowed inside the air ducts.
For rectangular ducts the respective air duct diameter is calculated as follows:
.gif)
D = air duct diameter
H = air duct height
B = air duct width
x
x
x
x
