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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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26
Inlet Air Vent
You may use the same material as used for exhaust or any material that is the same diameter that provides a pressure tight
connection. THIS IS ONLY FOR INLET AIR, NOT FOR EXHAUST PIPING!
The air inlet must be a minimum of 12" (305mm) vertically above the maximum snow level. It is very important that there are no
other vents, chimneys or air inlets in any direction for at least 48" (1220mm).
All venting must be properly supported. The ABH is not intended to support any venting whatsoever.
All piping, glue, solvents,
cleaners, fittings and components, must conform to ASTM (American Society for Testing and Materials), and ANSI (American
National Standards Institute).
Venting Runs That Exceed Maximum Combined Length
If the combined venting length of a heater’s exhaust/inlet air system exceeds the Maximum Combined Length called out in Table 4.1
contact Armstrong Hot Water, Inc. for an engineered venting calculation. Do not proceed without calling Armstrong Hot Water, Inc.
VENT CALCULATION EXAMPLE: Installation requires the following material for both inlet and exhaust piping for the ABH HW 299.2
(maximum combined equivalent length is 225 feet (69m)).
Required: 6 Pcs. 90° elbow (6 x 5 = 30 equivalent feet)
= 30 equivalent feet (9.1m)
(1.8m x 1.5m = 9.1m)
Required: 20' (6m) of Plastic PVC Pipe (20 x 1 = 20 equivalent feet)
= 20 equivalent feet (6m)
(6m x .3m = 6m)
Required: Inlet air in vertical termination (2) 90° bird screen)
= 11 equivalent feet (3.3m)
Required: Exhaust coupling
= 1 equivalent foot (.3m)
Total Friction Loss in equivalent feet
= 62 equivalent feet (18.9m)
Heater Removal From An Existing Common Vent System
At the time of removal of an existing heater, the following steps shall be followed with each appliance that remains
connected to the common venting system placed in operation, while the other appliances that remain connected to
common venting system are not operating.
1. Seal any unused openings in the common venting system. The ABH venting is NOT to be combined with this older
venting system!
2. Visually inspect the venting system for proper size and horizontal pitch to determine if there is blockage, leakage,
corrosion or other deficiencies that could cause an unsafe condition.
3. If practical, close all building doors, windows and all doors between the space in which the appliance remains
connected to the common venting system and other spaces in the building. Turn on clothes dryers and any
appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and
bathroom exhausts, at maximum speed. Do not operate a summer exhaust fan. Close all fireplace dampers.
4. Place the appliance being inspected in operation. Follow the lighting instructions. Adjust the thermostat so the
appliance will operate continuously.
This Vent System Is Ok
Venting - continued
DANGER! The ABH is not intended to be common vented with any other existing appliance!
Multiple ABH products may be common vented, only if using an engineered system by
Armstrong Hot Water, Inc.