Duct
pieces
Equivalent
number
.............................................................................................................................
!e_used
-
Total
3-114"x10"
1 Ft.
x
=
Rect.,
straight
" Round,
1 Ft.
=
x
straight
7"-I0"
Round,
1 Ft.
x
)
=
• straight
3-1/4" x 10"
Rect.90 °
elbow
3-1/4"
x 10"
Rect.45 °
elbow
15 Ft.
x
)
=
9 Ft.
x
)
=
L.......................
_ ........................
3-1/4"x10"
24Ft.
x(
)
=
Rect. 90 o
flat elbow
3-1/4"x10"
30Ft.
x(
)
=
Rect.
wall cap
with damper
3-1/4"x10"
5Ft.
x(
)
=
Rect. to
6" round
transition
?
3-1/4"x10"
20 Ft.
x(
)
=
Rect.to
6" round
transition
90 o elbow
6" Round,
15 Ft.
x (
)
=
90 o elbow
6" Round,
9 Ft.
x (
)
=
45 o elbow
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Subtotal
column
1 =
Ft.
Maximum
Duct Length:
For satisfactory
air movement,
the total duct length should not exceed 100 equivalent feet•
Duct pieces
Ft.
Equivalent
number
length
x used
=
Total
6" Round
30 Ft.
x (
)
=
wall cap
with damper
•
oun i: ............
O•R .....................
..................
roof cap
6" roundto
' 1 Ft.
3-1/4"
x 10"
rect.
transition
6" round to
3-1/4"
x 10"
rect.
transition
90 o elbow
7"-10"
Round,
90 o elbow
7" - 10"
Round,
45 o elbow
x(
) =
16 Ft.
x(
)
=
Ft.
Ft.
Ft.
7" round to
3-1/4"
x 10"
rect.
transition
90 o elbow
Subtotal
column
2 =
Ft.
Subtotal
column
1
=
Ft.
Total
ductwork
=
Ft.
I
O
iim
m
m
m
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