The intention of this guide is to give clients a basic understanding on choosing fans and identify any accessories they may need.
The information is general in nature and does not constitute specific advice to any client. Fans On Line does not take responsibility for a client's choice of a fan or accessories.
1) Capacity
Manufacturers generally recommend an exhaust fan to have a capacity of 10 times the air volume in the room (height x width x length). If a fan is being ducted out, it is usually better to increase the capacity to offset air resistance caused by the duct, bends, grilles, etc.
2) Wall Mount
Most of the exhaust fans will need a grille / vent for the back of the fan, if installed in a wall.
3) Ducting fans out
If exhausting into the ceiling space (and other areas), it is important to make sure there is somewhere for the exhausted air to go out to the outside. If there is not, then it is suggested you exhaust through the eaves, side or through the roof.
You will then need some flexible duct (size to match fan) and a vent (grille) or a cowl kit for the roof.
