Roberts Gorden UHD[X][S][R] 350 Concentric Vent Box, Vertical Option, Horizontal Option

12" (31 cm) Minimum from wall to vent termination.

SECTION 6: VENTING

Figure 7: Separated Combustion Heater - Vertical and Horizontal Vent Termination

12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance).

Vent

Air Intake*

NOTE: Vent supports not shown. Duct supports not shown. Duct and vent supports not provided by the manufacturer.

12" (31 cm) Minimum from air inlet to vent

Vertical

Option

90° Bend

Model	Vent Diameter	Terminal P/N
UHD[X]S[R] 150 - 400	4" (10 cm)	90502102
Model	*Air Intake Diameter	Terminal P/N
UHD[X]S[R] 150 - 250	4" (10 cm)	90502102
UHD[X]S[R] 300 - 400	5" (13 cm)	90502105

Horizontal

Option

Air Intake

Vent

Condensate Trap to Drain (Optional)

Listed Thimble through Combustible Wall

termination (may be horizontal or vertical clearance).

Air Intake

Termination

Vent

Termination

12" (31 cm)

Minimum from wall to vent termination.

Figure 8: Concentric Vent Box

4" (10 cm) or 5" (13 cm)

1/4"

(6

cm)

dia,

V

cm)

R

of4"

(10

Model

.Selkirk

piece

ent

One

“B”

v

type

others)

airspace

.(By

alent

iv

qu

or

e

Toward Outside

Seal joint between single wall and Type B vent with silicone sealant.

6" (15 cm) Single Wall Inlet Air Pipe (By Others)

Combustion Air to Heater

Exhaust from Heater

4" (10 cm) Single Wall Vent Pipe (By Others)

Use 3 sheetmetal screws equally spaced around joint.

Concentric

Vent Box

Use 3 sheetmetal screws equally spaced around collar.

13