Installation Ductwork Calculation Sheet

www.zephyronline.com

Duct pieces	Equivalent number
	lenght x used		=	Total
3 1/4 ” x 10”	1 Ft.	x (	) =	Ft.
Rect.,
straight
6 ” Round,,	1 Ft.	x (	) =	Ft.
straight
7", 8”	1 Ft.	x (	) =	Ft.
Round,,
straight
3 1/4 ” x 10”	15 Ft.	x (	) =	Ft.
Rect.90°
elbow
3 1/4 ” x 10”	9 Ft.	x (	) =	Ft.
Rect.45°
elbow
3 1/4 ” x 10”	24 Ft.	x (	) =	Ft.
Rect.90°
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° elbow
6 ” Round,,	15 Ft.	x (	) =	Ft.
90° elbow
6 ” Round,,	9 Ft.	x (	) =	Ft.
45°elbow
	Subtotal column 1			=

Maximum Duct Length: For satisfactory air movement, the total duct length should not exceed 100 equivalent feet.

Duct pieces	Equivalent number
	lenght x used		=	Total
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° elbow
7", 8" round	15 Ft.	x (	) =	Ft.
90° elbow
7", 8" round	9 Ft.	x (	) =	Ft.
45° elbow
7", 8" Round	30 Ft.	x (	) =	Ft.
wall cap
with damper
7", 8"	30 Ft.	x (	) =	Ft.
Round,
roof cap
7” Round to	8 Ft.	x (	) =	Ft.
3 1/4 ” x 10”	8 Ft.	x (	) =	Ft.
3 1/4 ” x 10”
rect.
transition
6” Round to	15 Ft.	x (	) =	Ft.
3 1/4 ” x 10”	15 Ft.	x (	) =	Ft.
3 1/4 ” x 10”
rect.
transition
90° elbow
	Subtotal column 2			=
	Subtotal column 2			=
	Total ductwork			=

Installation - Ductwork Calculation Sheet

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