XD-9010-TS3-S Rev A 04/2009
Installation & Operation Manual
21
Requirements vary throughout the country depending 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.
