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Re: firewall oops
Fire rated walls, ceilings, floors, etc., have a fire rating by design, and that fire rating applies to both sides of the 'separation'.
A "through penetration" is one which penetrates one side and goes all the through and out the other side. An example of a through penetration is a duct 'going through' a wall or floor/ceiling assembly.
A "membrane penetration" is one which penetrates one side ... and stops. An example of a membrane penetration is an electrical box, tub/shower control valve, something for which a hole is only cut into one side of the wall. I.e., one "membrane". A fire rated assembly has a membrane, something else (could be air and studs), then another membrane.
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