provide ventilation and combustion air supply to allow proper combustion of
fuel, chimney draft, and maintenance of safe temperatures… where buildings
are so tight that normal infiltration does not provide the necessary air, outside
air shall be introduced.”
for Commercial Cooking Operations) as its ventilation standard. While NFPA
96 allows direct ventilation with factory-built grease ducts or properly
constructed welded ducts (with fire-rated enclosures), it also permits the
exhaust hood ventilation option for our units.
Option Two: Exhaust Hood Venting (Figure 5)
U.L. 2162 cites NFPA 96 (Standard for Ventilation Control and Fire Protection
Combustion Air
Make sure adequate combustion air is available. Excerpt from NFPA 211 12.3:
“Solid-fuel burning devices shall be installed in a location and manner so as to
Combustion Air
Make sure adequate combustion air is available. Excerpt from NFPA 211 12.3:
“Solid-fuel burning devices shall be installed in a location and manner so as to
The building air balance is very important to the proper operation of your Oyler
Pit. The Oyler design is based on the induction of air into the pit due to the
“stack effect” of the chimney. The “stack effect” is the term used to describe
the upward airflow created in a chimney based on the chimney height and the
temperature difference between the bottom (inlet) and top (discharge). This
“stack effect” induces airflow into the oven chamber via the front door opening
(when the doors are open) and/or into the firebox when either the firebox door
is open along with open bypass dampers or an open exit flue damper, or, if the
firebox door closed, when the firebox combustion air damper is open.
Disruptions of this airflow can be caused by mechanical exhaust fans,
buildings that are too airtight (insufficient openings for incoming air), and
chimney downdrafts created by wind. Such downdrafts are often created by
nearby windbreaks, which are taller than the chimney top. For this reason, the
chimney should be four feet taller than the surrounding rooftop including
nearby parapet walls, and taller than adjacent buildings and trees. If air
balance cannot be achieved by normal means, you should consider using a fan
to assist the stack effect. A fan on the terminus of a chimney can solve the
problem. We recommend fans manufactured by Enervex (www.enervex.com)
such as their Model GSV installed with a variable-speed controller. These fans
are available through J&R and other sources.
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