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Cutting fire-rated vent into a mineral-core fire-rated door

Cutting fire-rated vent into a mineral-core fire-rated door


Old 08-18-13, 02:24 PM
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Join Date: Aug 2005
Location: USA
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Cutting fire-rated vent into a mineral-core fire-rated door

A supplier for the vent warned me that this might be difficult. I've not done it before so didn't even know to expect something not easy.

I will be installing a fire-rated, automatically-closing, vent (approx 12x18") through a 90-minute fire door. What should I know?

My first thought was just to drill the corners and use a circular, reciprocating, or jig saw, like any other door.


Last edited by MAC702; 08-18-13 at 02:48 PM.
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Old 08-18-13, 05:25 PM
PJmax's Avatar
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According to several sites I was reading at:

Lite and louver openings in fire-rated doors must be machined at the factory or by an approved licensed machiner.

Apparently any opening over 1" and not factory provided voids the fire rating of the door.
Old 08-18-13, 05:32 PM
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On one commercial site (assisted living), we could not even install peep holes at the residents' request due to degradation of the fire rating, so I'd check up really good with the door manufacturer as well as the vent manufacturer to see if they will be compatible.

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