Pellet stove Ventilation

June 30, 2008 · Filed Under Pellet Stove Installation 

What are the purposes of venting systems?

Proper ventialation is an essential for proper appliance performance, dwelling safety, maintenance frequency, and general indoor environment. Pellet stoves appliances will produce little or no visible smoke after startup, but water vapour,exhaust gases and fine ash must be removed safely from the appliance to the outdoors.

The purpose of all vents is to remove combustion by-products during normal pellet stove operation. For most pellet stove designs the exhaust is mechanical by means of blowing the combustion by-products out and pulling air needed for combustion into the fire, nowdays few pellet stoves operate without a combustion air fan and use natural draft both for exhaust and combustion air intake. Protection of nearby combustibles is essential. The minimum clearance between the vent and combustibles, as specified in the vent installation instructions, must be met or exceeded.

What materials and products can be used to vent pellet stoves?
The product specifically tested and listed for use with pellet stoves is PL vent pipe, labeled as tested to UL 641. PL vent pipe is double wall pipesystem with a stainless steel inner pipe that carries the exhaust products is separated from the outer pipe an air space which must be air tight to stop any leaks. Stoves tested and listed requiring PL vent must use no substitute venting materials.

Venting materials and products that MUST not be used to vent pellet stove appliances include:

  • Dryer vent
  • Gas appliance (Type B) vent
  • PVC (plastic) pipe
  • Single wall stove pipe (unless clearly approved by the installation manual and local codes)

Pellet fireplace inserts and freestanding pellet stoves are often vented into existing masonry and factory-built fireplace and woodstove chimneys (Figure 8).

The chimney- should be inspected before installation to ensure that it is clean, mechanically sound, and meets local safety code requirements. The appliance manufacturer’s installation instructions may require relining the chimney with an approved metal liner, pipe, or PL vent. Vents or grilles on the face of factory-built fireplaces which provide cooling air to the outside jacket of the fireplace must not be blocked. Cleanout access for future maintenance should be considered.

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