Any combustible flooring or floor covering beneath the appliance and/or within the area extending horizontally at least 450 mm (18 in) beyond the appliance on any side equipped with a door, and 200 mm (8 in) beyond the appliance on the other sides, shall be protected by a continuous, durable, noncombustible pad that will provide ember protection thick metal sheet or a grouted ceramic floor-tile surface installed in accordance with the National Building Code of Canada shall be considered a durable pad. A floor pad shall not be placed on top of a carpet unless the pad is structurally supported to prevent displacement and distortion.
An appliance with less than 75 mm (3 in) of clearance between the floor protection pad shall be supported off the floor protection pad by two courses of 90 mm (3.5 in) thick hollow masonry, clay or concrete units, arranged so that the hollow cores in the two courses are at right angles to each other to permit air circulation through them.
A wood burning or solid fuel burning appliance with at least 75 mm (3 in) of clearance, but less than 175 mm (7 in) of clearance, between the appliance bottom and the floor pad protection pad shall be supported off the floor protection pad by a single course of 90 mm (3.5) thick hollow masonry, clay, or concrete units arranged to allow air circulation through the hollow cores or when supported directly on the the floor pad, provided that two sheet metal plates, the size of the appliance bottom and at least 24 gauge in thickness, are installed between the appliance bottom and at least 25 mm (1 in) apart and 25 mm (1 in) from the appliance bottom and the floor pad by noncombustible spacers or attachments to the appliance legs.
A solid fuel-burning boiler may be mounted directly on a floor pad, provided that the water chamber extends under the whole of the combustion chamber and the ashpit if provided.
A passageway of at least 600 mm (224 in) shall be provided for access to inspection openings. Except as permitted by Clause 7.2.4. the minimum clearance between any solid-fuel-burning appliance and combustible material (other than the floor), whether or not such combustible material is covered with noncombustible material such as plaster, shall conform to Table 2, unless appliance is certified for lesser clearances.
The Table 2 clearances for uncertified appliances and the listed clearances of certified (or “listed”) appliances may be reduced in accordance with the clearance provisions of certified heat shields or if the following requirements are satisfied in accordance with Table 3: Wall protection shall be installed to provide clearance along the bottom of the shield equivalent to at least 25 mm (1 in) and not more than 75 mm (3 in), and clearance along the top of the shield of at least 75 mm (3 in), to allow a vertical flow of air. This protection shall extend at least 500 mm (20 in) above the appliance and 450 mm (18 in) beyond the sides of the appliance as shown in Figure 6. The ceiling protection shall have a least 75 mm (3 in) edge clearance on all sides, as shown in Figure 6. If an adhesive is used to support noncombustible material, it shall not ignite or lose its adhesive qualities at temperatures likely to be encountered. The heat shield mounting hardware shall be installed to allow full vertical ventilation. Such hardware shall be placed not closer than 200 mm (8 in) from the vertical center-line of the appliance, except for diagonal corner installations.
The clearance between a solid-fuel-burning appliance and a fuel oil storage tank shall be at least 1.5 m (5 ft). except that the authority having jurisdiction may permit a lesser clearance in accordance with CSA Standard B139.
