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TULE
1
Calculate Total
Equtialent
DutioA
Len@h
EquNdent Number
Equivalent
Duct Pieces
Length*x
Used
=
Length
5“ round,
D;r:::d
2.7 X (
fi.)t=
ft
straight ‘
1
x
(
fi.)t=
ft
3%”
x
10”
straight
1
x (
fi.)t=
ft
@
5“, 90°
elbow
37ti.
x ( ) =
ft
6“, 90°
elbow
15fi. x ( ) =
ft
@
5“, 45°
elbow
18fi. X (
)=
R
6“, 45°
elbow
9fi.
x ( ) =
ft.
Flexible
Metal Offset See Calculations
Adapter
in Step 5A
ft.
3%”
x
10”
90° elbow
16fi. X ( ) =
ft.
3%”
x
10”
45°
elbow
5fi. x ( ) =
ft.
@
3%”
x 10“
90° flat elbow
18
H.
X
( ) =
fi.
5“
round
%
to
3%”
x 10”
transition
3
h.
x (
)=
ft.
6“ round
to
3%”
x 10”
transtion
7R.
x ( ) =
ft.
Subtotal Column 1
=
ft.
* Equivalent lengths of duct pieces are based
on actual tests and reflect requirements for good
ven~
performance with any downdraft
cooktop.
~
Measure and
fist
feet of straight duct used.
Count and
fist
the quantity of
W
other duct
pieces for the ‘Number
Used”
of each type.
lMmmMT
For
mfium
efficiency, use the shortest and
straightest duct run possible, with as few
fitigs
as possible. For satisfactory performance,
tie
duct run
shotid
not exceed 100 feet
*tient
length.
Venting performance is improved by using
larger diameter
duct
Equivalent Number
Equivalent
Duct Pieces
Length*x
Used
=
Length
5“ round
to
3%”
x
10”
transition
Q
90° elbow
37fi.
x ( ) =
ft.
6“ round
to
3%”
x 10”
transition
90° elbow
2ofi.
x (
)=
fi
%
3%”
x
10”
to
6“ round
transition
5fi. x ( ) =
ft.
%
3%”
x 10”
to 6“ round
transition
90° elbow
12 fi. x (
)=
fi
Tapered
@
5“ round
to 6“ round
transition
6 fi. X ( ) =
ft.
5“ round collar
&
to 6“ round
cap transition
13 fi. x ( ) =
ft.
5“ round
@
wall cap
wtih
damper
84 fi. X ( ) =
ft.
6“ round
wall cap
with damper
21
R.
x ( ) =
ft.
=
3%”
x
10”
wall cap
with damper
27
H.
X ( ) =
ft.
6“ round,
roof cap
20 x ( ) =
ft.
6“ round,
roof vent
24 X (
)=
H
Subtotal Column 2 =
n.
Subtotal Column 1 =
n.
TOTAL DUCWORK=
ft.
Should not exceed 100 feet.
Hflexible
meti
ducting
is used;
d
the equivalent
feet values in the table should be doubled.
me
flexible
meti
duct
shotid
be straight and smooth
and extended as much as possible.
DO
N~
use
fl~ble
plastic
du~g.
Vent initiation should not exceed 100 feet
equivalent length.
Blower is rated at 400
Cm
at 0.1 inch of water
back pressure.
(cmtinued
ndpwe)
37