Alberta Building Code
Clearance from Combustibles

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9.22.9.  Clearance of Combustible Materials

9.22.9.1.  Clearance to Fireplace Opening

1)  Combustible material shall not be placed on or near the face of a fireplace within 150 mm of the fireplace opening, except that where      the combustible material projects more than 38 mm out from the face of the fireplace above the opening, such material shall be not        less than 300 mm above the top of the opening.
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9.22.9.2.  Metal Exposed to the Interior

1)  Metal exposed to the interior of a fireplace such as the damper control mechanism shall have not less than a 50 mm clearance from      any combustible material on the face of the fireplace where such metal penetrates through the face of the fireplace.
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9.22.9.3.  Clearance to Combustible Framing

1)  Not less than a 100 mm clearance shall be provided between the back and sides of a fireplace and combustible framing, except
     that a 50 mm clearance is permitted where the fireplace is located in an exterior wall.
2)  Not less than a 50 mm clearance shall be provided between the back and sides of the smoke chamber of a fireplace and
     combustible framing, except that a 25 mm clearance is permitted where the fireplace is located in an exterior wall.
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9.22.9.4.  Heat Circulating Duct Outlets

1)  The clearance of combustible material above heat-circulating duct outlets from those outlets shall be not less than
     a)  300 mm where the combustible material projects not less than 38 mm from the face, and
     b)  150 mm  where the projection is less than 38 mm.