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8.3.1
Shield Construction Rules
− Adhesives used in shield construction must not ignite or lose adhesive qualities at temperatures
likely to be encountered.
− Mounting hardware which extends from the shield surface into combustibles may be used only at
the edges of the shield.
− Mounting hardware must allow full vertical ventilation.
See figures on next page for shield construction to match each letter to a clearance.
Minimum clearance between the appliance top and an unshielded combustible ceiling: (50 ½")
A)
(1283 mm) .
B)
Shield extension above the appliance: 20" (500 mm).
Minimum space behind the shield: 1" (25 mm). In Canada ⅞" (21 mm).
C)
D)
Clearance along the bottom of the shield: minimum 1" (25 mm) and maximum 3" (75 mm).
E)
Minimum clearance along the top of the shield at the ceiling: 3" (75 mm).
F)
Mounting hardware must not be located closer than 8" (200 mm) from the vertical centre line of
the appliance.
G) Edge clearance for ceiling shields to side and back walls: 3" (75 mm).
H)
Shield extension beyond each side of the appliance: 18" (450 mm).
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