Attributes . Initial Resistance @ 500 fpm . Values

0.13 in wc (4)   0.16 in wc (50)   0.20 in wc (12)   0.21 in wc (2)   0.22 in wc (41)   0.22" WC (1)   0.23 in wc (11)   0.23" WC (1)   0.25 in WC (11)   0.25" WC (1)   0.26 in wc (9)   0.27 in wc (5)   0.28 in wc (106)   0.29 in wc (4)   0.30 in wc (90)   0.31 in wc (12)   0.32 in wc (108)   0.33 in wc (580)   0.35 in wc (14)   0.36 in wc (31)   0.37 in wc (355)   0.38 in wc (16)   0.40 in wc (36)   0.44 in wc (27)   0.45 in wc (18)   0.45" WC (12)   0.48 in wc (5)   0.49 in wc (2)   0.50 in wc (232)   0.52 in wc (13)   0.53 in wc (2)   0.55 in wc (40)   0.56 in wc (6)   0.58 in wc (10)   0.60 in wc (4)   0.61 in wc (7)   0.64 in wc (8)   0.65 in wc (20)   0.68 in wc (1)   0.75 in wc (3)   0.80 in wc (25)   0.98 in wc (2)