Zephyr AK2142, AK2100, AK2148, AK2136 manual Installation Ductwork Calculation Sheet

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Installation - Ductwork Calculation Sheet

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. 900
elbow
3 1/4” x 10”	9 Ft.	x (	)	=	Ft.
Rect. 450
elbow
3 1/4” x 10”	24 Ft.	x (	)	=	Ft.
Rect. 900
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
900 elbow
6” Round,	15 Ft.	x (	)	=	Ft.
900 elbow
6” Round,	9 Ft.	x (	)	=	Ft.
450 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”

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
900 elbow
7” Round,	15 Ft.	x (	)	=	Ft.
900 elbow
7” Round,	9 Ft.	x (	)	=	Ft.
450 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
900 elbow
	Subtotal column 2 =				Ft.
	Subtotal column 1 =				Ft.
	Total ductwork			=	Ft.

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