3 ways to vent high-efficiency boilers

Heating · Distribution Systems · printed page 158 (PDF page 159)

Original page Sign in to save

Book index entries

Three Ways to Vent Three Ways to Vent High Efficiency Boilers

Text in the illustration

exhaust at least 12" above roof or snow level
combustion air intake
venting material typically PVC, CPVC or polypropylene
Canada - must be ULC S636
sidewall 2-pipe
exhaust at least 12" above grade or snow level
through roof 2-pipe
sidewall concentric vent/intake
exhaust
boiler

Generated explanation

A schematic house section shows three high-efficiency boilers with alternative exhaust and combustion-air piping arrangements. The left boiler uses separate sidewall pipes, with a downturned combustion-air intake and an exhaust labeled to terminate at least 12 inches above grade or snow level. The center boiler uses separate pipes through the roof, with a downturned intake and an exhaust labeled to extend at least 12 inches above the roof or snow level. The right boiler uses a sidewall concentric vent/intake termination that combines the two air paths at a single wall penetration. Red identifies exhaust paths and blue identifies combustion-air intake paths; annotations list typical plastic vent materials and the Canadian ULC S636 requirement.

Components

high-efficiency boilers exhaust vent piping combustion-air intake piping sidewall two-pipe termination through-roof two-pipe termination sidewall concentric vent/intake termination pipe elbows roof exterior walls

Materials

PVC CPVC polypropylene