Attributes . For Nominal Duct Diameter . Values

10 in (12)   12 in (10)   14 in (5)   16 IN (2)   18 in (2)   21 in, 22 in (2)   23 in, 24 in (2)   25 in, 26 in, 27 in, 28. (2)   3 in - 4 in (2)   33 in, 34 in, 35 in, 36. (2)   37 in, 38 in, 39 in, 40. (2)   4 in (8)   41 in, 42 in, 43 in, 44. (2)   45 in, 46 in, 47 in, 48. (2)   6 IN (23)   7 in (2)   8 in (18)   9 IN (1)   Not Applicable (77)