infinity said:
I'm sorry Ronnie, but what does "by pulling in the nut" mean?
Yeah! We don't allow sex talk here!
Seriously, without using the word "nut", explain the setup as it was/would be without the fire system. I've done several fire-suppression-system connections. The "nut" may be a gas valve.
However, he may be referring to the final tightening of the automatic fire-detection link-and-cable system. Steel wires run inside the EMT pipes they run, with little pulleys in the elbows.
The cable under tension trips the gas valve (the "nut"?) when any of the links, like the ones inside the exhaust hood, melt, and the pull handles manually trip the same spring-wound mechanism.
The usual setup is that, regardless of the intake (if there is one) and exhaust fan switch position(s), when the sysyem trips, the intake must shut down and the exhaust must run.
Additionally, any electrical equipment covered by the exhaust hood must de-energize. Sometimes, it's easier to switch a sub-panel than individual circuits in an all-electric kitchen.
