18" circulation fans

Small 18" circulation fans (1/15 hp) are installed to move air along the ceiling towards the cold ends of a house.  Guidelines for installing/operating circulation fans:

1) Ideally 50' to 60' on center.

2) Fans should be touching the ceiling.

3) Fans should blow air horizontally along the ceiling (not directed up or down)

4) Fans should run continuously during minimum ventilation.