In the photos, the furnace is in the garage. The issues I’m concerned about are the supply ducts lacking duct wrap and furnace not installed on a platform. Also, if anyone else notices deficiencies that I missed, please rescue me from my ignorance! Thanks.
For one thing, in my area (Tulsa, OK) that type of ducting is not allowed in the garage. Any exposed ducts in a garage must be fireproof. Non-fireproof ducts must be run inside a fire rated chase.
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It is the same around here in Michigan.
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R302.5.2 Duct penetration. Ducts in the garage and ducts
penetrating the walls or ceilings separating the dwelling
from the garage shall be constructed of a minimum No. 26
gage (0.48 mm) sheet steel or other approved material and
shall not have openings into the garage.
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The wrap/insulation doesn’t really matter. What’s most important is maintaining the fire separation between the garage and the living areas. As Bob pointed out, that involves a certain metal thickness as well as not having gaps or openings.
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