Outside Combustion Air Supply - Roberts Gorden Energytube EM-115 Nstallation, Operation And Service Manual

8.11 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.
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 terminal.
Use of optional outside combustion air is not
recommended with unvented heaters.
8.11.2 Vertical Outside Air Supply for Single Heater Installation
SIDE VIEW
Description
Vent Cap 4" (10 cm) for 80,000 Btu/h
and 115,000 Btu/h models
Vent Cap 5" (13 cm) for 150,000 Btu/h
and 200,000 Btu/h models
8.11.3 Horizontal Outside Air Supply for Single Heater Installation
SIDE VIEW
Description
Vent Cap 4" (10 cm) for 80,000 Btu/h
and 115,000 Btu/h models
Vent Cap 5" (13 cm) for 150,000 Btu/h
and 200,000 Btu/h models
Part Number
90502300
90502301
Vent Cap
4"
(10 cm)
Min.
Part Number
90502300
90502301
8.11.1 Length Requirements
Follow the constraints listed on Page 32, Section 8.6.
For 80 and 115 models,
4" (10 cm) Single Wall Pipe.
For 150 and 200 models,
5" (13 cm) Single Wall Pipe.
Flex Hose
(Recommended)
Band Clamp
(Recommended)
SECTION 8: V
Burner
ENTING
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