Stoves may be installed with clearances less than those specified in Table 1 provided the combustible materials is protected as described in Table 2 or Figure 1.
TABLE 2
Clearances, Inches, with Specified Forms of Protection
Type of Protection Applied to the Where the required clearance with no protection is: combustible mater- ial unless other- wise specified and 36 Inches 18 Inches 12 Inches covering all surfaces within the distance specified Sides Sides Sides as the required Above & Connector Above & Connector Above & Connector clearance with no Rear Rear Rear protection (see Fig. 1) Thick- nesses are minimum (a) 1/4 in. transite, cao wool mill- board spaced out 1 in. 30 18 30 15 9 12 9 6 (b) 28 gage sheet metal on 1/4 in. transite, cao wool millboard 24 18 24 12 9 12 9 6 Clearances, Inches, with Specified Forms of Protection Type of Protection Where the required clearance with no protection is: 36 Inches 18 Inches 12 Inches Sides Sides Sides Above & Connector Above & Connector Above & Connector Rear Rear Rear (c) 28 gage sheet metal spaced out 1 in. 18 12 18 9 6 9 6 4 (d) 28 gage sheet metal on 1/8 in. transite, cao wool mill- board spaced out 1 in. 18 12 18 9 6 9 6 4 (e) 1 1/2 in. transite, cao wool millboard cement covering on heating appliance 18 12 36 9 6 18 6 4 (f) 1/4 in. transite, cao wool mill- board on 1 in. mineral fiber bats reinforced with wire mesh or equivalent 18 12 18 6 6 6 4 4 (g) 22 gage sheet metal on 1 in. mineral fiber bats reinforced with wire or equivalent 18 12 12 4 3 3 2 2 |
Except for the protection described in subsection (e) hereof, all clearances shall be measured from the outer surface of the appliance to the combustible material disregarding any intervening protection applied to the combustible material.
Spacers shall be of noncombustible material.
FIGURE 1
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A equals the required clearance with no protection, specified in Table 1.
B equals the reduced clearance in accordance with Table 2. The protection applied to the construction using combustible material should extend far enough in each direction to make C equal to A.
(Ord. 1984-17. Passed 5-15-84.)