www.zephyronline.com

Ins ta lla tion - Ductwork C a lcula tion S heet

Duct pieces

Equivalent number

Total

 

length x used

 

=

3 1/4” x 10”

1 Ft.

x (

)

=

Ft.

Rect.,

 

 

 

 

 

straight

 

 

 

 

 

7” Round,

1 Ft.

x (

)

=

Ft.

straight

 

 

 

 

 

7” Round,

1 Ft.

x (

)

=

Ft.

straight

 

 

 

 

 

3 1/4” x 10”

15 Ft.

x (

)

=

Ft.

Rect. 90 0

 

 

 

 

 

elbow

 

 

 

 

 

3 1/4” x 10”

9 Ft.

x (

)

=

Ft.

Rect. 45 0

 

 

 

 

 

elbow

 

 

 

 

 

3 1/ 4” x 10”

24 Ft.

x (

)

=

Ft.

Rect. 90 0

 

 

 

 

 

flat elbow

 

 

 

 

 

3 1/4” x 10”

30 Ft.

x (

)

=

Ft.

Rect.

 

 

 

 

 

wall cap

 

 

 

 

 

with damper

 

 

 

 

 

3 1/4” x 10”

5 Ft.

x (

)

=

Ft.

Rect. to

 

 

 

 

 

6” round

 

 

 

 

 

transition

 

 

 

 

 

3 1/ 4” x 10”

15 Ft.

x (

)

=

Ft.

Rect. to

 

 

 

 

 

6” round

 

 

 

 

 

transition

 

 

 

 

 

90 0 elbow

 

 

 

 

 

6” Round,

15 Ft.

x (

)

=

Ft.

90 0 elbow

 

 

 

 

 

6” Round,

9 Ft.

x (

)

=

Ft.

45 0 elbow

 

 

 

 

 

 

Subtotal column 1 =

Ft.

Maximum Duct Length: For satisfactory air movement, the total duct length of a 3 1/4” x 10” rectangular, 6” or 7” or 8” diameter round duct should not exceed 100 equivalent feet.

Duct pieces

Equivalent number

Total

 

length x used

 

=

6” Round

30 Ft.

x (

)

=

Ft.

wall cap

 

 

 

 

 

with damper

 

 

 

 

 

6” Round,

30 Ft.

x (

)

=

Ft.

roof cap

 

 

 

 

 

6” round to

1 Ft.

x (

)

=

Ft.

3 1/4” x 10”

 

 

 

 

 

rect.

 

 

 

 

 

transition

 

 

 

 

 

6” round to

16 Ft.

x (

)

=

Ft.

3 1/4” x 10”

 

 

 

 

 

rect.

 

 

 

 

 

transition

 

 

 

 

 

90 0 elbow

 

 

 

 

 

7” Round,

15 Ft.

x (

)

=

Ft.

900 elbow

 

 

 

 

 

7” Round,

9 Ft.

x (

)

=

Ft.

45 0 elbow

 

 

 

 

 

7” Round

30 Ft.

x (

)

=

Ft.

wall cap

 

 

 

 

 

with damper

 

 

 

 

 

7” Round,

30 Ft.

x (

)

=

Ft.

roof cap

 

 

 

 

 

7” round to

8 Ft.

x (

)

=

Ft.

3 1/4” x 10”

 

 

 

 

 

rect.

 

 

 

 

 

transition

 

 

 

 

 

7” round to

15 Ft.

x (

)

=

Ft.

3 1/4” x 10”

 

 

 

 

 

rect.

 

 

 

 

 

transition

 

 

 

 

 

90 0 elbow

 

 

 

 

 

 

Subtotal column 2 =

Ft.

 

Subtotal column 1 =

Ft.

 

Total ductwork

=

Ft.

4

Page 6
Image 6
Zephyr CTP-E 60SX, CTP-E 48SX manual Ins ta lla tion Ductwork C a lcula tion S heet, Duct pieces Equivalent number Total