no sealing duct is quite tight, but again... this is a conditioned space.
Conditioned space or not the SA plenum should be insulated to R-6/ R-8 in unconditioned spaces and the ducts should be sealed. The returns MUST be sealed per IRC for first 10ft. for combustion safety and new work should have a duct blaster test done. It also improves performance and is probably the single best thing you can do for any forced air system regardless whether a code officials *requires* it or not.
Hey, you asked for nit picking! BTW, rest looks very nicely done.
interesting you bring all that up too. i agree that it definitely won't hurt my cause but i'm quite curious how much i would actually benefit from having my ducts sealed. beyond the fact that i have supply registers in the basement too.
The code is also addressing CAZ depressurization if there are other atmospherically vented appliances.
However, since ya'll seem to think this is BS, you can contact the IRC and tell them why they should rescind N1103.2.2, M1601.4.1, & M1602.2 for starters.
Then again, you always have *Best Practices* that call for sealed ducts to balance the system.
You could come ride with me for a year Hearthman, and I guarantee out of all the service calls we would do in a year we would see less than 10 systems with sealed and insulated ductwork and 9 of those would be attics or crawls. I am not disagreeing with you that it should be done.
I'm starting to see sealed ductwork on more and more new construction jobs but still not both sealed and insulated.
A draft interference test should be part of every tuneup where there are atmospheric burners to ensure sufficient combustion air.