Outside Combustion Air Supply - Roberts Gorden ENERGYTUBE AG Series Installation, Operation & Service Manual

8.12 Outside Combustion Air Supply

IMPORTANT: If the building has a slight negative
pressure or corrosive contaminants, such as
halogenated hydrocarbons, are present in the air, an
outside combustion air supply to the heater is
required. Seal all combustion air pipe joints.
Use of optional outside combustion air is not
recommended with unvented heaters.
The air supply duct may have to be insulated to
prevent condensation on the outer surface. The
outside air terminal must not be more than 1' (31 cm)
above the vent termination while maintaining a
minimum distance of 3' (93 cm) for both vertical and
horizontal venting.
8.12.2 Vertical Outside Air Supply for Single Heater Installation
Description
Vent Cap 4" (10 cm)
Part Number
90502300
8.12.1 Length Requirements
Follow the constraints listed on Page 35, Section 8.6.
SECTION 8: V
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