Roberts Gorden BH-100, BH-60, BH-40, BH-150, BH-175, BH-115, BH-140 Outside Combustion Air Supply

SECTION 8: VENTING

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.

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 terminal.

8.11.1 Length Requirements

Follow the constraints listed on Page 36, Section 8.6.

8.11.2 Vertical Outside Air Supply for Single Heater Installation

Description	Part Number
Vent Cap 4" (10 cm)	90502300

8.11.3 Horizontal Outside Air Supply for Single Heater Installation

Vent Cap

	4" (10 cm)
Wall	Single Wall Pipe
	Flex Hose
	(Recommended)
	Burner
	Band Clamp
	(Recommended)

Description	Part Number
Vent Cap 4" (10 cm)	90502300

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