2.2 Planning ahead
1. Observe proper combustion air requirements.
2. Provide a firm support system for the chimney fan.
3. Determine the type of system involved.
4. Observe proper safety measures are taken to assure safe use of the wood burning appliances.
Combustion air requirements
Provisions for combustion air must be in accordance with applicable local codes.
Adequate fresh air must be provided for combustion; otherwise, improper operation and inadequate
venting of deadly flue gases may result.
Support system
Prior to installation of the chimney fan, it must be assured the chimney can
safely carry the weight of
the chimney fan.
A steel chimney should be well supported at the roof penetration point.
If the chimney extends more
than 20’ above
the roof, the chimney and the fan should be secured by wires attached on the chim-
ney and on the roof at 2 to 3
different points.
Brick chimneys usually do not need any kind of support to carry the weight of the chimney fan.
System type
Fireplaces and wood stoves used in residences normally operate in a relatively stable environment,
where no major
pressure fluctuations occur.
However, speed adjustments and adjustment of air-
intakes are required as the wood
burns and new wood is added to the fire.
Fireplaces used in restaurants are exposed to major pressure changes.
Doors open, doors close,
kitchen exhaust
fans pull out air, etc.
Spillage can easily occur.
Wood-fired pizza ovens and barbecues are normally installed in restaurant kitchens where kitchen ex-
haust fans are
operating.
Consequently, the operator should pay attention to the fact that even with a
well balanced exhaust
system, it will be necessary to adjust the fan speed in order to avoid spillage.
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