I wanted to install an vent fan to cool down the attic. This is 100%
attic air. No air sucked in from the living space. The house is in
Contractor says this fan needs an automatic shut-off in case there's a
smoke or fire condition. I have not heard of this requirement. Is
Best answer is to check w/ your local building department to see if it
is actually local code or not.
In general it wouldn't be a bad thing to do but I'm not sure the
"automatic" part is widely required other than commercial or
multi-family dwellings, though.
CA now (and perhaps others by now as well) has the requirement in
house/wildlands interface zone that soffet vents be auto-closing style
for fire protection during wildfires. Don't know what their code says
about the powered ventilation fan itself.
*I have seen this in commercial buildings, but never in residential units.
Usually a manual shut-off switch near the fan is required for servicing
purposes. The best place to get an answer for this is your local building
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