User Manual

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SEDONA BY LYNX™ VENT HOOD CARE & USE/INSTALLATION10
Always run ventilator ducts to the outdoors. DO NOT terminate a duct into an attic,
basement, garage, crawl space under a house, a chimney, other ducting or an enclosed room.
4. Dampers
IMPORTANT: DO NOT USE ANY TYPE OF DAMPER IN A VENT HOOD APPLICATION.
In ventilation systems utilizing a roof cap or wall cap with a built-in damper, remove it. Dampers are unnecessary and will
cause increased static pressure (air resistance), that may result in rattling, vibration and air buffeting noises, as well as
inadequate ventilation.
5. Roof Caps and Wall Caps
The roof cap or wall cap is the termination point of the venting system that allows the exhaust air to exit
to the outdoors. All sections of this fitting must have an equal or greater air path area than the ventilator’s
discharge port. If any section of the roof cap or wall cap is smaller than the ventilator’s discharge port, the
entire ventilation system will lose efficiency and the restriction will cause increased static pressure and decrease
performance.
IMPORTANT: Even though the intake side of the roof cap or wall cap may be properly sized, roof caps or wall caps
with built-in dampers should not be used. The actual open area of the final air path must equal to or greater than
the discharge port of the ventilator. Any undersized portion of a roof cap or wall cap will cause excessive static
pressure that may result in rattling, vibration and air buffeting noises, as well as inadequate ventilation.
Do Not use “goose-neck style” caps as they significantly restrict natural, heated air-flow. Do Not use caps with dampers
for Vent Hoods.
CARE AND USE ...continued
Opening 35”
10”
3.5”
10”
10”
24”
Diameter 9 3/4”
Opening 100 sq. in.
The air exit opening on the roof cap used needs to be at or above 78.5 square inches. See illustrations
above. Never use a roof cap like the one shown in Figure 1. Instead use a style similar to the one shown in
Figure 2.
6. Attaching Duct to House Framework
The ventilation system should be attached to the framework in such a manner that the weight of the duct
and fittings is supported with no stress on the duct joints, fittings or on the ventilator. All ducting should be
attached so as to avoid any possible duct vibration from being transferred to the house’s framework.
Please see next
page for
drawing of
optimum
performance
roof cap.