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Allied · Furnace troubleshooting

General vent termination requirements

A95/A93/95G1/92G1UH

What is going on

The furnace is Category IV in both non-direct and direct vent. Termination location is limited by local codes. Without local codes, use NFPA 54 (US) or CSA B149 (Canada).

Check in this order

  1. Place the termination according to figure 28 (non-direct) or figure 29 (direct).
  2. Keep the termination clear of obstructions and at least 12 in. above average snow accumulation.
  3. Do not place the exhaust outlet within 6 ft (1.8 m) of a condensing unit.
  4. Protect building materials from exhaust condensate.
  5. Insulate exhaust pipe with 1/2 in. (13 mm) Armaflex or equivalent if winter design temperature is below 32 F (0 C) and the pipe runs through unconditioned space.
  6. In areas below 20 F (6.7 C), use 3/4 in. (19 mm) insulation.
  7. Do not use screens or perforated metal in exhaust terminations.

Applies to: All vent terminations

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Source: Allied 92G1UH installation instructions manual, p. 27. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.