Substitute duct
lengths
Molded part
90° bend
45° bend
90° bend
45° bend
90° creased bend
45° creased bend
90° segmental bend (3
weld seams)
45° segmental bend (3
weld seams)
90° bend made of flex-
ible duct
45° bend made of flex-
ible duct
According to the number of bends, the substitute duct lengths must
be deducted from the maximum permissible duct length.
Notes for installer
Substitute duct length
PRI 214
PRI 217
r = 2 d
10" (0.25 m)
r = 2 d
5 ⅞" (0.15 m)
r = d
13 ¾" (0.35 m)
r = d
10" (0.25 m)
r = 2 d
27 ½" (0.7 m)
r = 2 d
21 ⅝" (0.55 m)
r = 2 d
17 ¾" (0.45 m)
r = 2 d
-
r = d
-
r = 2 d
19 ¾" (0.5 m)
r = 4 d
13 ¾" (0.35 m)
r = d
-
r = 2 d
15 ¾" (0.4 m)
r = 4 d
11 ¾" (0.3 m)
25