Venting Through Closed Spaces, Appliance Vent Adapter

Installing the water heater:

7/8" per foot	Wall Plates
downward slope

	94° Elbow
2’	Fire
2’	Stop	Vent Pipe
(61 cm)		Vent Pipe
Max .
	Ceiling
	Board
	Inspection	Inspection
	Access Panel #1	Access
		Panel #2

Venting Through Closed Spaces

If the coaxial vent piping passes through a closed space, a minimum clearance of 1” (2..5 cm) when installed horizontally or 6” (15 cm) when installed vertically should be maintained between the coaxial vent pipe and combustibles and noncombustibles.. Be sure to follow local codes and vent manufacturer’s installation instructions..

For maintenance and inspection purposes, the following access panels are required..

●Two (2) inspection access panels large enough to allow access for venting inspection.. One (1) of these access panels should be close to where the coaxial vent pipe enters the ceiling.. The other access panel should be near the vent termination..

●A ventilation access panel with a 16 in2 (103 cm2) opening should be provided every 10 ft (3 m)..

CAUTION: Ensure that the appliance vent adapter is securely attached to the water heater collar.

Exhaust
Flow
	Appliance
A	Vent Adapter
A
	Collar
B
Water Heater

Appliance Vent Adapter

The water heater must be installed with a UL 1738 approved Category III Stainless Steel appliance coaxial vent adapter.

Read the following instructions before installation..

●Test fit the adapter over the water heater collar before proceeding..

●Slide adapter end “A” down over heater collar “B” as far as it will go..

●Use the screws provided with the vent adapter to attach the adaptor to the heater collar..

NOTICE: Follow the appliance coaxial vent adapter manufacturer’s instructions..

CAUTION: Condensate is known to be acidic; refer to local, state (provincial) or federal codes for proper handling and discharge methods.

CAUTION: Condensate must drain away from the water heater and should not be allowed to drain back into any part of the vent system.

WARNING: Failure to provide a vent condensate drain close to the appliance could allow acidic flue gas condensate to enter into appliance flueways, causing premature failure of the appliance.

Draining the Condensate

Provision should be made to collect and dispose of condensate from venting systems..

When a water heater is vented horizontally, the vent pipe can have a DOWNWARD or UPWARD slope towards the termination.. If an UPWARD slope is used, a condensate trap must be installed as close as practical to the water heater in order to prevent condensate from draining back into the water heater.. See Examples A and B on page 13 and 14 for DOWNWARD and UPWARD slope for horizontally vented water heaters..

When a water heater is vented vertically, an UPWARD slope must always be used.. A condensate trap must be installed in the horizontal section of the vent and as close as practical to the water heater in order to prevent condensate from draining back into the water heater.. See the diagram on page 14 showing UPWARD slope for vertically vented water heaters..

Always attach a drain hose to the drain fitting and plumb the hose to a sanitary sewer drain..

A high temperature silicone tubing suitable for use with acidic condensate and appropriate for the temperature range should be used..

The drain tube is fashioned into a “pigtail” trap and must be filled with water to prevent flue gases from emitting into the building prior to operating the appliance..