Zephyr ZML-M90AG/AS - Manual (Page 7)

5
Duct pieces
Total
Equivalent number
length x used =
3- 1/ 4” x 10”
Rect.,
straight 1 Ft. x ( ) = Ft.
8” Round,
straight 1 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. 90
0
elbow
15 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. 45
0
elbow
9 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. 90
0
flat elbow
24 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect.
wall cap
with damper 30 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. to
6” round
transition 5 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. to
6” round
transition
90
0 elbow
20 Ft. x ( ) = Ft.
6” Round,
90
0 elbow
15 Ft. x ( ) = Ft.
6” Round,
45
0 elbow
9 Ft. x ( ) = Ft.
Ft.
7” Round,
straight 1 Ft. x ( ) = Ft.
Subtotal column 1 =
Duct pieces
Total
Equivalent number
length x used =
6”- 8” Round
wall cap
with damper 30 Ft. x ( ) = Ft.
Round
wall cap
with damper
30 Ft. x ( ) = Ft.
7” or 8”
Round,
90 0 elbow
15 Ft. x ( ) = Ft.
7” or 8”
7” or 8”
Round,
45 0 elbow
9 Ft. x ( ) = Ft.
Ft.
Ft.
Ft.
6”- 8” Round,
roof cap 30 Ft. x ( ) = Ft.
7” or 8”
Round,
roof cap
30 Ft. x ( ) = Ft.
Subtotal column 2 =
Subtotal column 1 =
Total ductwork =
Maximum Duct Length: For satisfactory air movement,
the total duct length of a 3 1/ 4” x 10” rectangular 6” or 7”
diameter round duct should not exceed 100 equivalent feet.
6” round to
3- 1/ 4” x 10”
rect.
transition 1 Ft. x ( ) = Ft.
6” round to
3- 1/ 4” x 10”
rect.
transition
90
0 elbow
16 Ft. x ( ) = Ft.
7” round to
3 1/ 4” x 10”
rect.
transition 8 Ft. x ( ) = Ft.
7” round to
3- 1/ 4” x 10”
rect.
transition
90
0 elbow
23 Ft. x ( ) = Ft.
Installation –
Ducting Calculation Sheet