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NSTALLAT ON NSTRUOTBONS (continued)
TABLE 1--Calculate Total Equivalent
Ductwork Length
Equivalent Number
Duct Pieces Length*x Used =
5" round,
straight 2.7 X ( ft.)t=i
6" round,
straight t X ( ft.)t= I
3V4"x10"
straight
(_ 5", 90°
elbow 37 ft. x (
6", 90 °
elbow ( ) =
( )=
Equivalent
Length
ft.
ft.
1 x ( ft.)t= ft.
=
)= ft.
15ft. x
5", 45 °
elbow 18
6", 45"
elbow 9 ft. x
Flexible
Metal Offset
Adapter
3¼"x 10"
90 ° elbow
3¼" x 10"
45 ° elbow
3¼" X I0"
90° flat elbow
See Calculations
in Step 5A
16ft. x ( )=
5ft. x ( )=
18ft. x ( )=
3ft. x ( )=
7 ft. x ( )=[
Subtotal Column I =
5" round
to 3¼" x 10"
transition
6" round
to 3¼" x 10"
transition
it,
it,
ft,
ft.
ft_
it,
ft.
ft,
ft,
ft.
* Equivalent lengths of duct pieces are based on actu-
al tests and reflect requirements for good venting
performance with any downdraft cooktop.
t Measure and list feet of straight duct used. Count
and list the quantity of all other duct pieces for the
"Number Used" of each type.
[MPORTANT
For maximum efficiency, use the shortest and straight-
est duct run possible, with as few fittings as possible.
For satisfactory performance, the duct run should
not exceed 100 feet equivalent length,
Venting performance is improved by using larger
diameter duct.
i Duct Pieces
5" round
to 3¼" x 10"
transition
6 round
to 3W' x 1O"
transition
90° elbow
3W' x t0"
to 6" round
transition
3¼" x 10"
to 6" round
transition
90 ° elbow
Tapered
5" round
to 6" round
transition
5" round collar
to 6" round
cap transition
5" round
wall cap
wghdamper 84 ft. x
6" round
wa!l cap
withdamper 21 ft. X
3¼"x 10"
wall cap
with damper 27 ft. X
' 6" round,
roof cap 20 X
6" round,
roof vent
Equivalent Number Equivalent
Length*x Used = Length
37 ft. x ( )= ft.
20ft. x ( )= ft.
5ft. x ( )= ft.
12ft. x ( )=
6ft. x.( )=
ft,
it,
13ft. x ( )= ft.
( )= ft.
( )= _.
( )= ft,
( )= ft,
24 x ( )= ft,
'Subtotal Column 2 = ft,
Subtotal Column 1 = ft,
TOTAL DUCTWORK= ft.
Should not exceed 100 feet.
If flexible metal ducting is used; all the equivalent feet
values in the table should be doubled. The flexible
metal duct should be straight and smooth and extend-
ed as much as possible.
DO NOT use flexible plastic ducting.
Vent installation should not exceed 100 feet equiva-
lent length.
Blower is rated at 400 CFM at 0.1 inch of water back
pressure,
6
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