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Non-Direct Vent/1-Pipe System Sizes 040 Through 120 Only)

In a non-direct vent (1-pipe) system, all air for combustion is taken from the area adjacent to furnace, and all flue products are discharged to outdoor
atmosphere. A factory-supplied perforated disk assembly (in loose parts bag) MUST be used in combustion-air pipe elbow.

WARNING: CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result
in carbon monoxide poisoning or death.
The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other
appliances connected to the venting system are not in operation:
1. Seal any unused openings in venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1-2002/NFPA

54-2002 or the CSA B149.1, Natural Gas and Propane Installation Code and these instructions. Determine that there is no blockage
or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

3. As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to

the venting system are located and other spaces of the building.

4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and

bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.

6. Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating

continuously.

7. Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use

the flame of a match or candle.

8. If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National

Fuel Gas Code, ANSI Z223.1-2002/NFPA 54-2002 and/or CSA B149.1, Natural Gas and Propane Installation Code.

9. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above,

return doors, windows, exhaust fans, fireplace dampers and any other gas-fired burning appliance to their previous conditions of
use.

Materials

Combustion-air and vent pipe, fittings, primers, and solvents must conform to American National Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards. See Table 7 for approved materials for use in the U.S.A.

WARNING: FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in fire, property damage, personal injury, or death.
Solvent cements are combustible. Keep away from heat, sparks, and open flame. Use only in well-ventilated areas. Avoid breathing
in vapor or allowing contact with skin or eyes.

In Canada, construct all combustion-air and vent pipes for this unit of CSA or ULC listed schedule-40 PVC, PVC-DWV or ABS-DWV pipe and
pipe cement. SDR pipe is NOT approved in Canada.

In direct vent (2-pipe) systems, combustion air and vent pipes must terminate together in same atmospheric pressure zone, either through roof or
sidewall (roof termination preferred), using accessory termination kit. See Table 8 for required clearances.

Table 7—Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials

ASTM SPECIFICATION

(MARKED ON MATERIAL)

MATERIAL PIPE FITTINGS SOLVENT CEMENT AND PRIMERS

DESCRIPTION

D1527

ABS

Pipe

—

Schedule-40

D1785

PVC