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Found a 2"x4" hole in return duct

It sounds to me like someone was planning on installing a return into the bathroom. A return is NEVER to be installed in a bathroom, so there wouldn't have been one, and you said there were also no ...
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Do old vents need to be removed if ridge vent is installed?

The Code says: Attic Ventilation shall be “cross ventilation “ and shall be 1/150th the area that is to be vented. (See ICC R806 Vents.) However, there is one exception: The attic ventilation can be ...
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