Closures/hardware

[Inspector Gadget]

Is nfpa 80 verified *latch* hardware stamped/labelled in some subtle way that I can readily identify? I know that panic bars are labelled, but it occurred to me that I can't recall seeing a standard latch labelled...

 

[Yankee Chronicler]

I think so, but I can't remember what the marking is. A "standard" latchset may have a latchbolt with a throw of (IIRC) 3/8". A latchset or lockset labeled for use on a firedoor has a minimum latchbolt throw of (again IIRC) 3/4". (Some might allow 1/2") A lockset or latchsest has to have a U.L. (or equivalent) label for use on a fire door. The "U.L." is typically stamped into the face of the bezel surrounding the latchbolt -- the part that gets recessed into the edge stile of the door.

 

[Inspector Gadget]

I think so, but I can't remember what the marking is. A "standard" latchset may have a latchbolt with a throw of (IIRC) 3/8". A latchset or lockset labeled for use on a firedoor has a minimum latchbolt throw of (again IIRC) 3/4". (Some might allow 1/2") A lockset or latchsest has to have a U.L. (or equivalent) label for use on a fire door. The "U.L." is typically stamped into the face of the bezel surrounding the latchbolt -- the part that gets recessed into the edge stile of the door.

Anyone got pics of this?

 

[Yankee Chronicler]

From the Sargent web site:

 

[LGreene]

The minimum latch throw dimension was removed from NFPA 80 and the allowable throw is based on the manufacturers' listings (how they passed the fire test). You can see the UL mark on the Schlage latch below.

 

[LGreene]

There is also the UL directory where you can verify listings and any restrictions, but it can be a little challenging to navigate. https://productiq.ulprospector.com/en

 

[Inspector Gadget]

Yeah, I saw nothing during a recent inspection. Door was listed, closer and frame was not. So I *assumed* the latch wasn't..... But asked for "verification or replacement" as one does when one ain't 100 per cent sure.