Allied Furnace: Protecting walls from acidic flue gas
Protecting walls from acidic flue gas on a Allied furnace: Flue gas from a condensing furnace can be slightly acidic and can stain or eat into some building materials at the termination. A protective shield is required when the optional tee is used. Check what the exhaust will actually hit before you finish the termination.
Applies to: Sidewall terminations
Common causes of protecting walls from acidic flue gas
- Flue gas plume hitting siding, brick or other building material
- Optional tee used without a shield
- Gaps and cracks at the wall around the termination letting moisture in
How to fix protecting walls from acidic flue gas: step by step
- If flue gas will hit building material at the termination, install a corrosion-resistant shield at least 24 in. square.
- Build the shield from wood, plastic, sheet metal or other suitable material.
- Seal all seams, joints and cracks in the affected area with an appropriate sealant.
- Re-inspect the wall after the first season for staining or damage.
If the unit shows an error code, look it up: Allied Furnace codes
Models
92G1UH92G1UH0450892G1UH0451292G1UH0700892G1UH0701292G1UH0901292G1UH0901692G1UH1101692G1UH1102092G1UH1352095G1UHA93UHA95UH
Source: Allied 92G1UH installation instructions manual, p. 30. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.