25
DUCT LENGTH CHART
Duct Fitting
Number
Total Equivalent
Duct Fitting
Equivalent Length
of Fittings
Length–Fitting
8
"
Diameter 90° Elbow
5
'
(1.52 m)
6
"
Diameter 45° Elbow
2.5
'
(.76 m)
5
"
to 6
"
Transition
1.0
'
(12.7 cm to 15.24 cm)
(.30 m)
6
"
to 3
1
⁄
4
"
x10
"
90° Elbow
5
'
(15.24 cm to 8.26 cm x 25.4 cm)
(1.52 m)
3
1
⁄
4
"
x10
"
to 6
"
90° Elbow
9
'
(8.26 cm x 25.4 cm to 15.24 cm)
(2.75 m)
6
"
to 3
1
⁄
4
"
x10
"
90° Elbow
1
'
(15.24 cm to 8.26 cm x 25.4 cm)
(.30 m)
3
1
⁄
4
"
x10
"
to 6
"
Transition
4.5
'
(8.26 cm x 25.4 cm to 15.24 cm)
(1.37 m)
5
"
to 3
1
⁄
4
"
x10
"
90° Elbow
6
'
(12.7 cm to 8.26 cm x 25.4 cm)
(1.83 m)
3
1
⁄
4
"
x10
"
90° Elbow
5
'
(8.26 cm x 25.4 cm)
(1.52 m)
3
1
⁄
4
"
x10
"
Flat Elbow
12
'
(8.26 cm x 25.4 cm)
(3.66 m)
6
"
Wall Cap
28
'
(15.24 cm)
(8.53 m)
3
1
⁄
4
"
x10
"
Wall Cap
20
'
(8.26 cm x 25.4 cm)
(6.10 m)
10
"
x10
"
Roof Jack
0
'
(25.4 cm x 25.4 cm)
(0 m)
Thermal Break
2
'
(.61 m)
6
"
Diameter Straight Duct–Feet
1
'
(For flex duct multiply by 2.)
(.30 m)
3
1
⁄
4
"
x10
"
Straight Duct–Feet
1
'
(.30 m)
System Total
Air Flow
Air Flow
Air Flow
Air Flow
Air Flow
Air Flow
Air Flow this direction not recommended.
Air Flow this direction not recommended.
(continued next page)
Содержание JGP389
Страница 7: ...7 NOTES...
Страница 39: ...7 Notas...
