<div dir="ltr">I don't recall the details but return air systems adobe a certain size are required to have smoke detectors by NFPA 72 - The National Fire Alarmand Signalling Code - widely adopted by most jurisdictions in the US. I believe you can use heat detectors (most all today are combination fixed temperature and rate of rise) anywhere else in an assembly occupancy.<div><br></div><div>It's been on my list to work on - a change to NFPA 72 to make this easier - at least make the disabling of return air smoke detectors a right rather than a variance - but have not gotten to it yet. Working on a bunch of IBC changes now, and some refinements to Life Safety Code later this year. </div><div><br></div><div>The deadline to submit proposals to change NFPA72 is I believe June 10, for the 2024 edition. Not hard to do - all on line - and just demonstrating the problem to the committee is a step in right direction.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 25, 2021 at 2:49 PM Jerry Durand via Stagecraft <<a href="mailto:stagecraft@theatrical.net">stagecraft@theatrical.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Consider it a system test, if the smoke detectors DON'T trigger, they're<br>
broken. So the Fire Watch is part of maintenance budget.<br>
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On 1/25/21 11:39 AM, Riter, Andrew via Stagecraft wrote:<br>
> But failing that, some sort of "fire watch" with a disabled / silenced panel is often the typical solution.<br>
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-- <br>
Jerry Durand, WhatsApp, Telegram, VK, signal, Parler<br>
<a href="http://www.DurandInterstellar.com" rel="noreferrer" target="_blank">www.DurandInterstellar.com</a> & <a href="http://www.Durandinterstellar.ru" rel="noreferrer" target="_blank">www.Durandinterstellar.ru</a><br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature">Bill Conner Fellow of the ASTC</div>