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2
Venting
Horizontal Vent/Ducted Air venting (Powered Venting)
D
NOTICE
The Horizontal Vent/Ducted Air vent system is the same as the Sidewall Venting system, except it pulls combustion
air from the outdoors through a sidewall air inlet. Follow all requirements in Sidewall Venting section on page 23.
NOTE: CAT I B-VENT MATERIALS MAY BE USED WHEN THE
POWERED VENT IS CONNECTED DIRECTLY TO THE OUTSIDE
VENT CAP. IF THE POWERED VENT IS NOT CONNECTED
DIRECTLY TO THE OUTSIDE VENT CAP, THEN CAT IV - AL29-4C
VENT MATERIALS MUST BE USED FROM THE POWERED VENT
The Horizontal Vent/Ducted Air vent system requires you to install two pipes directly to the unit; one pipe for flue
TO THE OUTSIDE VENT CAP.
3'
products and one for combustion air. Install both pipes horizontally with a sidewall termination point. For this
MIN
12"
MIN
IMG00584
venting option, you must purchase the DV box accessory from the appliance manufacturer. The DV box attaches to
the air inlet of the unit. The pipe for combustion air attaches to the DV box (see FIG. 2-10 on page 29). Reference
page 29 for a list of approved air intake materials.
Make vent connection directly to the top of the unit. No additional draft diverter or barometric damper is required
on single unit installations with a dedicated stack and a negative draft maintained between 0.04 to 0.08 inches w.c.
The Horizontal Vent/Ducted Air combustion air supply system has specific vent material and installation
requirements. The air inlet pipe connects directly to the unit to supply combustion air. The combustion air inlet
pipe is a dedicated system with one air inlet pipe per unit. You must connect the air inlet pipe to a combustion air
inlet cap as specified in this section.
Combustion air supplied from outdoors must be free of contaminants (see the Combustion and Ventilation Air
section on page 10).
You must order the Horizontal Vent/Ducted Air Vent Kit for sidewall installation from the appliance manufacturer. See Table 2D
for kit numbers. Each kit includes a sidewall powered vent cap fan, proving switch, controls, combustion air inlet cap to supply air
to a single unit, the transition adapter to attach the field supplied single wall air inlet pipe to the unit and installation instructions.
Purchase flue pipe and air inlet pipe locally.
The sidewall air inlet cap supplied in the Horizontal Vent/Ducted Air Vent Kit is used to supply combustion air to a single water
heater. Combustion air supply pipes from multiple units can not be combined into a single air inlet pipe and inlet point.
WARNING Only use the sidewall air inlet cap recommended by the appliance manufacturer. Using another sidewall air
inlet cap may result in operational problems and the spillage of flue products. Spillage of flue products can
cause personal injury or death due to carbon monoxide poisoning.
Venting of flue products
For venting flue products horizontally, follow all requirements in the installation instructions for sidewall venting.
Termination point for the flue products must follow the clearance requirements in the Sidewall Venting Termination section on
page 23.
For proper operation, a barometric damper is provided for Horizontal Vent/Ducted Air installations. The damper will help to
ensure a draft between negative 0.04 to 0.08 inches w.c.
MODEL
400
500
650
750
--
*These kits include a barometric damper.
26
Before installing a venting system, follow all requirements found in the General Venting section.
TABLE - 2D
HORIZONTAL VENT/AIR KITS
KIT
9910112000
9910112000
9910112001
9910112001
--
Installation & Operation Manual
- see page 15.
MODEL
1000
1250
1450
1800
2100
KIT
9910112002*
9910112003*
9910112003*
9910112004*
9910112004*
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