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eceiPtcuD
10" round
to 8" roun d 5 ft.
Round , 1 ft.
straight (per foot
length)
3-1/4" x 10" 1 ft.
3-1/4" x 12 " (per foot
straight length)
8" Dia. 17 ft.
90° elbow 10" Dia. 24 ft .
8" Dia. 10 ft.
45° elbow 10" Dia. 14 ft .
3-1⁄4" x 12" 15 ft.
3-1/4" x 10" 14 ft.
90° elbow
3-1/4" x 10" 8 ft.
3-1/4" x 12" 9 ft.
45° elbow
3-1/4" x 10" 33 ft.
3-1/4" x 12" 36 ft.
90° at elbow
10"round transition
to 3-1/4" x 10" or
3-1/4" x 12" 9 ft.
3-1/4" x 10" or
3-1/4" x 12" to
10" round transition 6 ft.
10" round to 3-1/4" x 10" 16 ft.
3-1/4" x 12" transition 13 ft.
90° elbow
3-1/4" x 10" 9 ft.
3-1/4" x 12" t o 10" round 8 ft.
transition 90° elbow
Roun d 8" Dia. 32 ft.
wall cap 10" Dia. 41 ft.
wi th d amp e r
3-1/4" x 10" 24 ft.
3-1/4" x 12" wall cap 26 ft.
wi th d amp e r
Round 8" Dia. 44 ft.
roof cap 10" Di a. 56 ft.
Use this chart to compute maximum
permissable lengths for duct runs to
outdoors.
Note:
Do not exceed maximum permissable
equivalent lengths!
Maximum recommended duct
length for these hoods: 150 feet
Flexible ducting:
If exible metal ducting is used, all
the equivalent feet values in the table
should be doubled. The flexible
metal duct shou ld be straight and
smooth and extended as much as
possible.
Do NOT use exible plastic ducting
.
Total Duct Run
Note:
Any home ventilation system, such as a
gas furnaces, gas water heaters and other naturally
vented systems. To minimize the chance of interruption
of such naturally vented systems, follow the heating
equipment manufacturer’s guidelines and safety
standards such as those published by NFPA and ASHRAE.
*Hoods are supplied with a 10"
round transition. A locally
supplied transition is required
for other sizes.
Note:
Outlet on top of hood is
8-1/8" x 8".
Table 1. Ventilator performance calculation
7