|
size, dia. |
CFM
|
size, |
|---|---|---|
|
inches |
cubic feet/minute |
mm |
|
4 |
40 |
100 |
|
6 |
100 |
150 |
|
8 |
200 |
200 |
|
10 |
400 |
250 |
|
12 |
600 |
300 |
|
14 |
1,000 |
350 |
|
16 |
1,400 |
400 |
|
20 |
2,400 |
500 |
|
24 |
5,000 |
600 |
|
30 |
8,000 |
760 |
|
36 |
11,000 |
900 |
|
48 |
25,000 |
1,200 |
|
60 |
42,000 |
1,500 |
Friction loss of 0.08 inch of water per 100 feet of duct.
Reference: ASHRAE Fundamentals 32.7
For low noise commercial/ residential hvac ducts
R. Caldwell 1-9-98 revised 10-11-2003