CHIMNEYS


VERY IMPORTANT: Owners are required to engage the services of a member of the Association des professionnels du chauffage (APC) for the installation of chimneys.

Acceptable models

Masonry chimneys

  • With interior lined with refractory tiles.
  • With interior lined with stainless steel (metal sheathed)

Prefab chimneys

  • Type M, 650 C, with 2-inch thick insulation
  • Type ASHT designed for zero clearance fireplaces

Acceptable models according to type of heating unit

  • Wood-fired stove, wood-fired range, central wood-fired furnace: masonry chimney lined with refractory tiles or stainless steel chimney or Type M prefab chimney
  • Zero clearance chimney:  
  • prefab chimney, certified for this type of unit (see document provided by manufacturer)

 

Chimney clearance


Clearance required between prefabricated chimneys and combustible materials: 2 inches.

The prefabricated section of chimney must exceed 3 inches in front of combustible partition.

Minimum chimney height above roof

The chimney must extend at least 3 ft above the highest point of contact with roof.

OR

The chimney must extend at least 2 ft above highest point of contact with roof surface or above any structure within 10 feet (measured horizontally) from roof surface.

chimney

Unacceptable models


  • Prefab Type A chimney similar to Type M chimney but fitted with 1 inch of insulation (except for Excel Model made by ICC). (This type of chimney cannot support high temperatures generated by chimney fire.)
     
  • Unlined masonry chimney (refractory tiles or metal sheathing)
     
  • Shelf-mounted masonry chimneys can be dangerous because they can collapse and do not meet the standards of the National Building Code of Canada.
     
  • Hybrid chimney combining masonry chimney and prefab chimney (potentially acceptable if installation is certified by an APC member).

Unacceptable connections

  • Two (2) wood-fired units connected to the same chimney.
  • A wood-fired unit and oil-fired unit connected to the same chimney. This assembly could be acceptable if heating units meet the following requirements:
  • Connected to a code complying masonry chimney;
  • Heating units installed on same floor; and

The connection point of the connecting pipe of the wood-fired unit is situated at least 12 inches below the connecting pipe of the fuel-fired unit.
Wood-fired unit and fuel-fired unit connected to the same prefab chimney.
Unit installed directly under masonry chimney lined with refractory tiles. (This assembly could be acceptable if installation is certified by an APC member or if masonry chimney is metal sheathed.)

  • Hood above unit connected to air ducts of central furnace. This assembly could be acceptable if hood meets following requirements:

Hood is fixed 18 inches above heating unit;
Does not cover connecting pipe;
No blower inside hood;