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English 10
DUCT EQUIVALENT CHART
Size
(in./mm)
Eq u ivale n t
Length
(ft/m)
Size
(in./mm)
Eq u ivale n t
Length
(ft/m)
6 (152) 1.2 (0.37)
6 (152) 10 (3)
8 (203) 0.7 (0.21)
10 (254) 0.6 (0.18)
3¼" x 10"
(83 mm x 254 mm)
straight
N/A 1 (0.3)
3¼" x 10" (83 mm x 254 mm),
Center reverse elbow , right
N/A 25 (7.6)
3¼" x 14"
(83 mm x 356 mm)
straight
N/A 0.7 (0.21)
3¼" x 10" (83 mm x 254 mm),
Left reverse elbow
N/A 15 (4.6)
3¼" x 10" (83 mm x 254 mm),
Right reverse elbow
N/A 25 (7.6)
6 (152) 12 (3.7)
6 (152) 2 (0.6)
2 (0.6)
2 (0.6)
8 (203) 6 (1.8)
10 (254) 5 (1.5)
8 (203)
10 (254)
6 (152) 5 (1.5)
8 (203) 3 (0.9)
10 (254) 2 (0.6)
3¼" x 10"
(83 mm x 254 mm),
90° Elbow , round
N/A 5 (1.5)
2" (51 mm) long, 3¼" x 10"
(83 mm x 254 mm) flex
N/A 20 (6.1)
3¼" x 10"
(83 mm x 254 mm),
45° Elbow , round
N/A 15 (4.6)
3¼" x 10" (83 mm x 254 mm),
Roof jack and shutter
N/A 2 (0.6)
3¼" x 10"
(83 mm x 254 mm),
Flat elbow
N/A 20 (6.1)
6 (152) 5 (1.5)
8 (203) 2 (0.6)
6 (152) 10 (3)
NOTE: These commonly used installation parts can be purchased at
a local hardware store.
Measurements in inches (mm).
Round wall cap
Round roof cap
3¼" x 1
0" (83 mm x 254 mm)
to round 90° Elbow
Duct Pie ce
3¼" x 10" (83 mm x 254 mm)
Center reverse elbow , left
15 (4.6)N/A
3¼" x 10"
(83 mm x 254 mm)
to round
Round to 3¼" x 10"
(83 mm x 254 mm)
90° Elbow
Duct Pie ce
Smooth, straight
90° Elbow , round
45° Elbow , round
6 (152) 2 (0.6)
2 (0.6)
2 (0.6)
8 (203)
10 (254)
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