XD9010-TS Rev D 07/2008
20
Installation & Operation Manual
on the location by city, county, and/or state. 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. A
properly engineered and installed ventilation hood and HVAC system will expedite
approval, reduce oven maintenance cost, and provide a more comfortable working
environment. Keep the appliance area free from ventilation obstructions. Proper
ventilation is the oven owner’s responsibility. For the state of Massachusetts, and
possibly other locations, the exhaust fan must be interconnected with the ovens so that
the ventilation hood is operating before the ovens are allowed to operate.
5.9.2. VENTILATION GUIDELINES
A ventilation hood that extends at least 12" from each side of oven or conveyor and at
least 6" from the front must be used. Also, at least one fan must be used to exhaust heat
and CO. The ventilation hood must operate in harmony with the building’s HVAC
system. The ventilation hood is replacing and replenishing air while the HVAC system
is re-circulating air. A proper balance between replacing air and re-circulating air is
desired. If the exhaust fan removes too much air from the kitchen, this will force the
HVAC system to condition more air than necessary. Conversely, if the exhaust fan
removes too little air, then heat, CO, and products of combustion will accumulate inside
the building. The volume of air that goes into the building and the volume going out of
the building must be balanced or metered in the proper proportion to provide a safe,
comfortable, and economical environment. A belt driven exhaust fan is preferable to a
direct driven exhaust fan in that a belt drive unit can be readily adjusted by changing the
diameter of the drive and driven pulleys in order to move more or less air.
5.9.3. 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 products of combustion are being properly
exhausted. These smoke candles can be purchased through HVAC contractors. The test
procedure is outlined below.
1.
The oven must be operating at 450º- 500º F.
2.
The conveyor must be turned off.
3.
The ventilation hood exhaust fan must be turned on.
4.
Wear gloves to prevent burns to your hands.
5.
Put the candle on a pan.
6.
Open the sandwich door.
7.
Light the candle and immediately place the pan w/candle on the conveyor
belt at the center of the oven.
8.
Close the sandwich door.
9.
Observe the smoke pattern coming out of the oven.
The ventilation hood must capture all of the smoke from the oven.
