What year did the fire door latching standards change from requiring two latching points to three on a double pair of doors?
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This does not give a year, but::
Less Bottom Rod / Cable – For pairs of doors, fire exit hardware may be provided without the bottom rods/cables, bottom latches, and floor strikes. With this application, there are no bottom rods and latches to be damaged by cart traffic or to interrupt the flush area at the bottom of the door (as required by the accessibility standards), and no need for strikes in the floor. When the bottom rods and latches are omitted, most door and hardware listings require an auxiliary fire pin, which will project and keep the doors aligned during a fire. Because the pin only projects when a high temperature is reached, it does not present an egress problem and this type of hardware is allowed by the model codes.
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Hi Patrick -
Can you tell me where you are seeing this requirement? There are various combinations of products that are acceptable for use on fire door assemblies - some pairs have 2 latching points, some 3, some 4, or even more. It is dependent on the listings for the doors and hardware.
The one I'm thinking of wasn't a code change but a clarification by the testing labs. When approvals became widespread for the use of bottom fire pins (from one door leaf to the other at fire door pairs) instead of a bottom rod, several companies interpreted this to mean that bottom fire pins could also be used in lieu of bottom flush bolts. That was accepted for quite a while. I don't know exactly why, but a while ago (at least two years I think), the labs came out and said no, they weren't the same. If flush bolt manufacturer's wanted to eliminate the bottom bolt at fire door pairs, they had to re-test. As far as I know, no one has yet done this. I thought I found someone but it turned out that it was a clerical error between the manufacturer and UL, attaching the wrong part number to a set of flush bolts giving the impression that a top flush bolt with bottom fire pin was approved when it was really a set of flush bolts. I haven't checked the UL Building Materials Directory lately to see if the manufacturer has corrected it with UL. So, when using flush bolts on the inactive leaf, it went from 3-point latching to 2-point latching then back to 3-point latching.
Hi Raymond -
Ives has some automatic and constant-latching flush bolts that are listed for use on fire doors with a top bolt and fire pin (no bottom bolt). During a fire, the fire pin would project and keep the doors aligned, but under normal operation the inactive leaf just has a latch at the top. I'm not familiar with the misinterpretation that you mentioned. The Ives models that incorporate a fire pin are FB32, FB33RK, FB42, FB52, FB53RK, and FB62. All of these are shown in the UL directory with the pin.
I should have qualified my statement. This limitation only applies to WOOD fire doors with ratings greater than 20-minute. The FB42 is limited to 20-minute wood fire doors. That’s what I get for being in a hurry.
Raymond Holman, AHC, LEED Green Associate
Colorado Doorways, Inc.
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