Originally Posted by
Homeowner314
Plenum center of house, one trunk goes east, one trunk goes west. I like that part of the layout.
I've got 650cfm total on my branches, plus whatever goes through the basement grids in the trunks?
My floor grids are pretty slim too. I guess I need to add them to my list of things to measure. 650cfm is probably not enough...
Glad I didn't go with the guy who wanted to put a 70k on my existing ducts, everything he said seemed to be rule of thumb instead of specific to my house.
Installer I'm using says if I can get a Goodman for a lot less than he pays for a Gibson, I can plan it out and he'll hook it up.
Maybe I need to have him use his ductilator.
All of a sudden it looks like I need to start over from the beginning, with a room by room load calc and size my branch lines and floor openings to that. Good idea, lol
If I've got a 1200CFM blower and 39k BTU/hr of heat to work with, do I just use 10CFM of pipe for every 325 BTU/hr of heat load? How many CFM for 14' of 8" round (not flexible)?8" = 180cfm