Originally Posted by
Brian E Kelly
All this and not counting the break in the fire wall seperating the home from the garage.
Few places have ever required it to be built like a "fire wall", it was just made up of some 'fire rated' material, such as Type X gypsum board, but it was never intended to serve as a "fire wall".
Which is probably why it is now just considered as "separation" between the garage and the living space, and that "separation wall" can have 26 gage metal duct go through it. The problem, then, becomes 'where the metal duct terminate' (the duct may only be 30 gage instead of 26 gage anyway), and it should not terminate into the garage.
Jerry Mc. is correct: "What Jerry is referring to is the venting into the garage may only be the tip of the iceberg? When folks remodel it usually never stops at one obvious defect and old timers go into "overdrive" when they sense such."
You need to be looking for the part which sank the Titanic - the part underwater you don't see.