Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Thanks for the opportunity to help!
So a duct tied to a stud or framing with brackets within 2 feet of the end and it should be fine? I couldn't remember if the final end of a run was typically screwed into the floor or what.
I was planning on putting 2 1/4 X 10" duct into a 2X4 wall due to the stud size and a joist in the basement that seems to be in the way of using a 12".
How do they rate or compare a 2 1/4 X 10 to other duct options for flow, is it the equivilent of a 5" or even less? Possibly I could use a 12 but I don't know how to accomodate the joist in the basement that is squeezing me down to the 10" option.
I was referring to screwing it to the floor (at the floor where it protrudes) or directly below the floor. Maybe it's not neccesary, as long as I can get close to the end with some brackets.
I would probably be able to attach L brackets withing 10 inches from where it terminates into a floor register.
This is a supplemental run for a cold room that did have 3 uninsulated walls and a stairway to a loft where all the heat rises. I've insulated 2 of the 3 walls, so I'm hoping that adding a supplemental run (even if it's just a 2 1/4 X 10) will be helpful.
Do you think the size of this run (10 X 2 1/4) is worth the time for the heat it would add?
I've never run a complete duct before, is the best process to place the first piece through the floor and secure it with L brackets (in the wall). Then build on that (I have wall access) down to the basement where the supply and stack boot are waiting and then cut the final rectangular piece for length and put the indents in it for the boot ?
Ah OK, so it's not typical that you would do you supply line taking off from the furnace all the way to the bootstack. Stop, and build down the rectangular, cutting off the excess and hopefully get the bootstack to connect with the rectangular then.