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4.4.4 Room combustion air supply requirements:
The boiler must be provided with an adequate combustion air supply, the combustion air supply requirements must be
determined and sized in accordance to national and local codes having jurisdiction. CSA B149 & ANSI Z223.1 – More
than one combustion air source maybe required.
When air is taken from outside or through a vertical duct, maintain a minimum of one square inch of fresh air inlet for
every 4,000 BTU/H of total burner input. The area must be free of any restrictions such as louvers, or screens.
For air inlet through a horizontal duct a minimum of 1 square inch of fresh air let is required for every 2,000 BTU/H of
total burner input
An optional filter should be fitted air intake housing. This is highly recommended
Air supply venting materials:
Single wall aluminum, cpvc pps, and stainless steel material.
Air supply structure:
The air supply pipe must also be airtight. Horizontal sections in the air supply must slope away from the boiler towards
the supply opening and incorporate a drain connection if the route rises from a lower point. It is necessary to provide
an easily removable air vent for maintenance reasons.
WARNING
Motorized louvers shall be interlocked with the appliance so that they are proven open prior to the main burner
ignition and operation
4.4.5 Conventional vent system clearances
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Vent termination shall terminate at least 3 feet above any forced air inlet that is within 10 feet horizontally
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Vent system shall terminate at least 4 ft below, 4 ft horizontal from or 1 ft above any door, operable window or
gravity inlet into a building.
Direct Vent (sealed combustion) systems clearances
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Vent termination shall be located a minimum of 36 inches from any opening in the building. The bottom of the
vent termination shall be at least 12 inches above grade. Both air intake and vent termination must be 12 inches
above the highest expected snow fall lines.
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Do not terminate venting over areas where condensate vapors can affect or be detrimental to the operations of
regulators, relief valves or other equipment
Absolute Boilers 750-900-1050
Absolute Boilers 750-900-1050
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