Thermador HMWN30FS Installation Instructions - Page 7

Table 1. Ventilator performance calculation

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Table 1. Ventilator performance calculation Duct Piece Us e 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 Fl exible ducting: 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 extended as much as possible. Do NOT use flexible plastic ducting. 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". 10" round to 8" roun d Round , straight 3-1/4" x 10" 3-1/4" x 12 " straight 90° elbow 5 ft. 1 ft. (per foot length ) 1 ft. (p er f oot length) 8" Di a. 17 ft. 10" Dia. 24 ft . 45° elbow 8" Di a. 10 ft. 10" Dia. 14 ft . 3 -1⁄4" x 12" 3-1/4" x 10" 90° elbow 3-1/4" x 10 " 3-1/4" x 12 " 45° elbow 3-1/4" x 10" 3-1/4" x 12" 90° flat elbow 10"round transition to 3-1/4" x 10" or 3-1/ 4" x 12" 3-1/4" x 10" or 3-1/4" x 12" to 10" round transiti on 10" round to 3-1/4" x 10" 3-1/4" x 12" transition 90° elbow 3-1/4" x 10 " 3-1/4" x 12" t o 10" round transiti on 90° elbow Roun d wall c ap with damper 3-1/4" x 10" 3-1/4" x 12" wall cap with damper 15 ft. 14 ft. 8 ft. 9 ft. 33 ft. 36 ft. 9 ft. 6 ft. 16 ft. 13 ft. 9 ft. 8 ft. 8" Dia. 32 ft. 10" Dia. 41 ft. 24 ft. 26 ft. Round roof cap 8" Dia. 44 ft. 10" Di a. 56 ft . Total Duct Run 7

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e
c
e
i
P
t
c
u
D
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
"
(p er f oot
straight
length)
8" Dia. 17 ft.
90
°
elbo w
10" Dia. 24 ft
.
8" Dia. 10 ft.
45
°
elbo w
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
°
flat 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 transiti on
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.
transiti on 90
°
elbow
Roun d
8" Dia. 32 ft.
wall cap
10" Dia. 41 ft.
with damper
3-1/4" x 10"
24 ft.
3-1/4" x 12" wall cap
26 ft.
with damper
Round
8" Dia. 44 ft.
roof cap
10" Di a. 56 ft .
Us e 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
Fl exible ducting:
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
extended as much as
possible.
Do NOT use flexible 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