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Optima Installation and Operation Manual
7.4.2 Table of Clearance Reduction Percentages
Type of shield
Sheet metal, a minimum of 24
gauge (0.61 mm) in thickness ,
spaced out at least 25 mm (1 in)*
by non-combustible spacers
Ceramic tiles, or equivalent non-
combustible
material,
combustible board spaced out at
least
25 mm
(1 in)*
combustible spacers
Ceramic tiles, or equivalent non-
combustible
material,
combustible
board,
minimum of 24 gauge (0.61 mm)
sheet metal backing spaced out at
least
25 mm
(1 in)*
combustible spacers
Brick, spaced out at least 25 mm
(1 in)* by non-combustible spacers
Brick, with a minimum of 24 gauge
(0.61 mm) sheet metal backing,
spaced out at least 25 mm (1 in)*
by non-combustible spacers
* In Canada this space can be 21 mm (7/8 in)
32
Clearances may be
reduced by these
percentages
Sides
and rear %
67
on
non-
50
by
non-
on
non-
with
a
67
by
non-
50
67
Top %
(ceiling)
50
33
50
N/A
N/A
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