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Ventilation Requirements
A powered ventilation hood is required to remove heat and vapors. Some provision must
be made to replenish the amount of air that is extracted from the building. The hood and HVAC
installation must meet local building and mechanical codes. Requirements vary throughout the
country depending upon location. Proper ventilation is the oven owner’s responsibility. The XLT
hood system is designed to meet all requirements for XLT ovens and it is our recommendation that
this system be used.
Ventilation Performance Test
After the oven and ventilation hood have been installed and are operating, a smoke candle
can be used to “see” if the heat and vapors are being completely extracted. The test procedure is
outlined below:
The oven must be operating at 450º-500ºF / 232º-260ºC.
The conveyor must be turned off.
The ventilation hood exhaust fan must be turned on.
Put a smoke candle in a pan on the conveyor belt at the center of the oven.
Observe the smoke pattern coming out of the oven.
Repeat the smoke candle test for each oven, as well as when all ovens are operating.
The ventilation hood must capture all of the smoke from the oven.
After the exhaust fan has been adjusted to completely capture and contain the heat, there
needs to be a corresponding amount of make up air (MUA) introduced into the building to offset
the amount of air volume being removed. An air balance test can determine the proper amount of
make-up air flow rates.
Ventilation Guidelines
Obtain information from the authority having jurisdiction to determine the requirements for
your installation. Your ventilation hood supplier and HVAC contractor should be contacted to
provide guidance. An air balance test is highly recommended, and should be performed by a li-
censed contractor. A properly engineered and installed ventilation hood and HVAC system will
expedite approval, reduce all maintenance costs, and provide a more comfortable working environ-
ment. XLT also recommends that the operator controls for the ovens and the operator control for
the exhaust fan be interlocked so that the exhaust fan gets energized whenever the ovens are turned
on. For more information, see the following links at
Kitchen Ventilation Design Guide 1
Kitchen Ventilation Design Guide 2
Kitchen Ventilation Design Guide 3
Kitchen Ventilation Design Guide 4
OVEN VENTILATION GUIDELINES
