32
Solution 3.4 Installation and Operation Manual
7.4.2 Table of Clearance Reduction Percentages
Type of shield
Clearances may be reduced by these
percentages
Sides
and rear %
Top %
(ceiling)
Can/USA
(%)
USA
min.
Can/USA
(%)
USA
min.
Sheet metal, a minimum of 24 gauge
(0.61 mm) in thickness , spaced out at
least
25 mm
(1 in)*
by
non-
combustible spacers
67
12 in
50
18 in
Ceramic tiles, or equivalent non-
combustible
material,
on
non-
combustible board spaced out at least
25 mm (1 in)* by non-combustible
spacers
50
18 in
33
24 in
Ceramic tiles, or equivalent non-
combustible
material,
on
non-
combustible board, with a minimum of
24 gauge (0.61 mm) sheet metal
backing spaced out at least 25 mm
(1 in)* by non-combustible spacers
67
12 in
50
24 in
Brick, spaced out at least 25 mm
(1 in)* by non-combustible spacers
50
18 in
N/A
N/A
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
67
12 in
N/A
N/A
* In Canada this space can be 21 mm (7/8 in)
