size of ducts
size of ducts
(OP)
I have a supply duct which is on the basement and it serves 3 rooms above the basements. all rooms have opening on the floor so that the duct can go through. I have to supply one room for 50 CFM, one 75 CFM and the last one 300 CFM. If I use 0.08 in. of water per 100 feet of friction loss. What sizes I should use. Is there any limitation for choosing duct size.If I size one in 10"x7", should I jump it to 10"x8"?





RE: size of ducts
RE: size of ducts
To keep it simple with stock type materials I'd go with a 4" round to each of the two smaller loads and an 8" round to the 300 cfm load (with volume dampers at each take-off). The main could be an 8 x 10 as imok2 suggested, or you could probably go as small as 6 x 10 - would be 1,020 fpm.