Attributes . Duct Diameter . Values

10-3/8 in. (2)   12 (6)   12 3/8 in (4)   14 (1)   16 (2)   16 3/8 in (3)   18 3/8 in (4)   20 3/8 in (4)   21 in to 22 in (2)   23 in to 24 in (2)   25 in to 28 in (2)   3 (3)   3 in (6)   30-3/8 IN (2)   33 In. to 36 In. (2)   37 in to 40 in (2)   4 (12)   4 in (11)   4" & 6" round (1)   41 in to 44 in (2)   45 in to 48 in (2)   5 (3)   5.9375" (2)   6 (113)   6 in (4)   6" or 8" (2)   7 (48)   7 in (1)   8 (52)   8 in (3)   ?10% (33)   Not Applicable (14)