Wolf Appliance Company 1200 - Manual (Page 63)

Wolf Ventilation FAQ 63
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Frequently Asked Questions
HOW TO DETERMINE WHICH TYPE OF BLOWER TO USE?
Many factors can influence the decision between using an
internal, in-line or remote blower. The CFM (based on the
cooking appliance output), length of the duct run and
space available to mount the blower are primary consider-
ations.
Internal blowers are mounted inside the hood or down-
draft. In-line blowers are mounted between the hood and
the exterior of the home. Remote blowers can be mounted
on the roof or, in some cases, on an exterior wall.
HOW CAN BLOWER NOISE BE MINIMIZED?
Some blower noise is considered normal while the blower
is operating. If noise is a concern, a remote blower is
recommended. Using a remote blower will minimize the
amount of blower noise but will not eliminate the noise
completely. Where the remote blower is installed on the
home will also affect the amount of noise. To reduce noise
further for remote blower applications, an attenuator may
be necessary. An attenuator is an electronic device that is
effectively the opposite of an amplifier. While an amplifier
provides gain, an attenuator provides loss in sound level.
WHAT TYPE OF DUCTING IS RECOMMENDED?
Wolf hoods and downdrafts should be vented using
smooth, rigid metal ducting. The ridges found in flexible
metal ducting create turbulence and will diminish airflow.
The larger the ducting, the less noise there will be and the
better the rate of airflow.
HOW CAN THE DUCT RUN BE MOST EFFICIENT?
For maximum performance keep the duct run straight
and short, with a limited number of elbows and transitions.
45° elbows are more efficient than 90° elbows. Be sure to
use an external roof or wall cap. Wolf ventilation products
will operate most efficiently when ductwork does not
exceed 50' (15 m) in length.
WHAT IS MAKE-UP AIR?
When a ventilation hood or downdraft is operating, it
draws air from inside the house to the outside, creating a
slight vacuum within the house. This creates negative
pressure (pressure inside the house is less than the
pressure outside). If the negative pressure is strong
enough, it can cause the furnace and other fuel-burning
appliances to backdraft dangerous gases such as carbon
monoxide into the home. All exhaust fans need an
adequate supply of fresh air from the outside to operate
safely. The air needed for this purpose is called “make-up
air.” Check with a local HVAC professional to determine if
your heating or air conditioning system makes allowances
for additional make-up air. Make-up air can be introduced
by simply opening a window or door.