venting

Friend of mine just got a new place and the original dryer vent hole was cut to an unconventional size. Instead of 4" x 4" it's about 3.25" x 4", as seen here: We're not going to try a concrete hole saw, since it might travel too much and probably won't, at best, produce a clean whole. At...

Hello, I have a 2 stall attached garage that I would like to insulate. I would be insulating all the walls and ceiling and installing a mini split for heating and cooling. There will be an attic area above the ceiling, and this is what my question is, this area will be sealed off from the...