Is it possible to have someone re-size my main air supply plenum so I can get more height in my basement? My basement height now is only 81" as it is and the plenum is 8"x16" and is 22 feet long.
Even if it was moved to the outer wall it would be fine. However, this would require a 90 degree bend to get it there because the furnace is on the opposite wall. I assume this would restrict air flow.
A 90 degree bend will be less restrictive than thinning the duct to say 6" deep.
16x8 sounds very small,how many and what size runs do you have coming off of it?
How big a house do you heat and cool and what size furnace and a/c do you have?