Improper sidewall vent locations - mid- & high-efficiency furnaces

Heating · Condensing Furnaces · printed page 134 (PDF page 135)

Book index entries

Gas – Improper Sidewall Venting Gas – Venting Mid & High Efficiency Gas Furnaces Sidewall Vent – Improper Condensing Gas Furnaces Furnace – Condensing Gas Furnace – Condensing

Text in the illustration

- numbers vary in some areas and circumstances
- check local rules
mid-efficiency:
should be 4' below or
beside doors, windows,
or air inlets, and 1' above
high-efficiency:
1' window clearance
(3' if >100,000 BTU)
should be >2'
below soffit
should be 3'
from
regulator
should be >1'
above grade
should be >7'
above
walkway
other improper locations:
- should be 3' to 6' from
combustion air inlet for
other appliance
- should be 1' clearance
under veranda, porch,
deck or balcony
- shouldn't discharge at
inside corner formed by
two outside walls

Generated explanation

The illustration shows a house elevation with five sidewall furnace vent terminations marked by red prohibition symbols. Improper locations include a termination close below the soffit, one directly below a window, one near the gas regulator, one close to grade, and one too low above a walkway. Callouts give clearance guidance for mid- and high-efficiency furnaces, including different clearances around windows and other openings. Additional annotations address separation from another appliance's combustion air inlet, clearance beneath porches and decks, and avoiding discharge into an inside corner between exterior walls. The drawing notes that requirements vary by location and circumstances and directs readers to check local rules.

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