Ventilation Guide
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Cold weather installations. | Cold weather installations
may require an additional backdraft damper to minimize
backward ow of cold air. All Wolf ventilation hoods, except
low-prole wall hoods, come with a backdraft damper con-
nected to the transition. Downdraft systems do not have a
backdraft damper.
High altitudes. | Ventilation systems are less effective at
altitudes above 5,000'
(1524 m). At these altitudes, you
should estimate a 20–25% reduction in CFM performance.
A higher CFM blower and increasing the duct size
is recommended.
Make-up air. | Make-up air may be required to replace
air removed by the ventilation system. Consult a qualied
HVAC professional for specic applications.
Step 1: Determine the Duct Run
IMPORTANT NOTE: Consult a qualied HVAC professional
for specic installation and ducting applications.
Check local codes. | Consult a qualied HVAC professional
to ensure all applicable codes are followed. Refer to the
installation guide for your specic Wolf ventilation product.
Minimize the duct run. | The length of the duct run and
number of elbows and transitions can have a signicant
effect on ventilation performance. Keep the duct run as
short as possible and limit the number of elbows and transi-
tions. Do not use exible metal ducting.
Elbows and transitions. | Do not place elbows and transi-
tions back-to-back. Whenever possible, include a minimum
15"
(381) straight ducting between elbows and transitions to
increase ventilation performance.
Use recommended duct sizes. | Depending on the specic
ventilation product, Wolf recommends 8"
(203) or 10" (254)
ducting. Smaller duct sizes will signicantly reduce ventila-
tion performance.
DETERMINE THE DUCT RUN