Installation guide

Table 1. Ventilator performance calculation
DUCT FITTINGS Equivalent Quantit Total
1D Vata dices) Lenght* Used a
Use this chart to compute maximum 10" round
permissable lengths for duct runs to to8" roun d sft
outdoors. Round -
ound, .
. . G— straight (per foot
Note: Do not exceed maximum permissable length)
equivalent lengths! oo) t/a" x10" lft
- x .
Maximum recommended duct 3-1/4" x12" (per foot
length for these hoods: 150 feet straight length)
8" Dia. 17 ft.
Flexible ducting: 90° elbow 10" Dia. 24 ft .
If flexible metal ducting is used, all
the equivalent feet values in the table 8" Dia. 10 ft.
should be doubled. The flexible 45° elbow 10" Dia. 14 ft .
metal duct should be straight and
smooth and extended as much as 3-144" x 12" 15 ft.
possible. 3-1/4" x 10" 14 ft.
90° elbow
Do NOT use flexible plastic ducting. 3-1/4" x 10" 8 ft.
3-1/4" x12" 9 ft.
45° elbow
Note: Any home ventilation system, such as a h h
ventilation hood, may interrupt the proper flow of 3 Va x 10" 33
combustion air and exhaust required by fireplaces, 31/4 x12 36 ft.
gas furnaces, gas water heaters and other naturally 90° flat elbow
vented systems. To minimize the chance of interruption 10" round transition
of such naturally vented systems, follow the heating to 3-1/4" x 10" or
equipment manufacturer's guidelines and safety _ 3-1/4" x 12" 9 ft.
standards such as those published by NFPA and ASHRAE. 3-1/4" x10"
- x or
Q 3-1/4" x 12" to
Fate 10" round transition 6 ft.
S 10" round to 3-1/4" x 10" 16 ft.
Ten oe te yee ~ 3-1/4" x 12" transition 13 ft.
- 90° elbow
For 10” Round Duct
3-1/4" x10" 9 ft.
. . 3-1/4"x12"t 010" round = 8 ft.
*Hoods are supplied with a 10” Ye transition 90° elbow
round transition. A locally Roun d 8" Dia 32 ft
supplied
transition
is
required
J
wall
cap
in
"2.
2
i
for other sizes. with damper
Note: Outlet on top of hood is 31/4" x 10" 7 24 rt
8-1/8" x8". 3-1/4 X 12" wall cap 26 ft.
with damper
Round 8" Dia. 44 ft.
roof cap 10" Dia. 56 ft.
Total Duct Run