We lost our house in a wildfire Sept. 4th. The site is cleaned up and I'm planning the rebuild. Metal building, house 30x44, garage 30x24 and RV garage 18x46. Not sure if we have the funds to finish the inside of the house, so we may be in the RV for awhile.
But before I lock-in the metal building height, I need to make sure there is room in the attic for the main A/C duct. The main duct will be a straight run of about 32 ft, six rooms, half cathedral, half flat 8 ft ceilings. With a 3/12 roof pitch, I will have a max. height of about 36 inches, dropping 3 inches for each foot of width. Can anyone tell me what cross-sectional duct size is needed? Too early for a full A/C plan, it will be another week before the RV slab is poured. Thanks if you can help.