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Interlock with exhaust on type one hood
February 7, 2018
6:22 am
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george.gittinger@tudi.com
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So, does the gas solenoid valve need to be interlocked with exhaust fan?

If so, then stoves with manual standing pilot lights need be relit every time the hood exhaust system is restarted.

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On a parallel thought, is there any code that requires the hood exhaust to be on when pilot lights are lit due to the possibility of carbon monoxide contamination from multiple pilot lights being on?

March 19, 2008
9:01 am
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ba109
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The heat sensor option is listed in the 2006 IFGC.

March 19, 2008
8:10 am
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dr. j
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I was wrong about the 2003 IFGC not having 505.1.1. It does, and it says "505.1.1 Commercial cooking appliances vented by exhaust hoods. Where commercial cooking appliances are vented by means of the Type I or Type II kitchen exhaust hood system that serves such appliances, the exhaust system shall be fan powered and the appliances shall be interlocked with the exhaust hood system to prevent appliance operation when the exhaust hood system is not operating. Dampers shall not be installed in the exhaust system." Note the heat sensor option is not specifically mentioned.

The posts in CDA''s history lesson correctly identified this section.

March 19, 2008
5:03 am
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lockek
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As long as gas appliances are utilized, then any of the IFGC requirements may be cited. However, if all the appliances are electric, then the requirements of the IMC and NFPA 96 will apply and no sections of the IFGC may be applicable.

I do not believe 503.3.4 is intended for kitchen hoods or appliances under those hoods. Thus the section 505.1 was provided to specifically address kitchen hoods and interlocks.

March 18, 2008
5:34 pm
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dr. j
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I thought that topic sounded familiar. Thanks for the trip down memory lane CDA.

March 18, 2008
5:30 pm
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dr. j
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What do you mean [b]starting[/b] to enforce? An interlock between the appliance and the exhaust fan been required since at least 2003 in the IFGC (505.3.4).

With the 2006 version, there is now a chicken and egg conflict between IMC and IFGC, and the IFGC is in conflict with itself. The IMC says you have to automatically start the fan when the appliance is used, but the IFGC 503.3.4 says you can''t use the appliance until the fan is running. However, IFGC 505.1.1 allows for the use of the heat sensor option of the IMC.

Bottom line, there is only one practical way of meeting the 2006 codes - the heat sensor option of the IMC to start the fan after the appliances heat up the air entering the hood.

Note that the only way to truly meet the 2003 IFGC (which did not have IFGC 505.1.1, or IMC 507.2.1.1) is to use an electric solenoid valve in the gas line and wire that with the exhaust fan so it opens when the fan is started and closes when the fan stops. Note if the appliances have standing pilots, a big box of matches are required to re-light the pilot every time.

March 18, 2008
5:03 pm
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cda
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