ECN Forum Forums General Topics of the Trade General Discussion Area Air Handler Exhaust during fires.

Fireguy is correctm as far as the way we do it here. Every fire-suppression system we've wired in has the same parameters:

The exhaust must run, regardless of the switch's position, and the intake must not run, regardless of the switch position.

I figured out a way to do it using ony one of the two microswitches ours come with, requiring only three conductors between boxes.