Page 12
Product Specification Manual - HEI350
ENGLISH
Table 2 : Data for Floor Protection Calculation
A
B
C
D
E
Air Jacket
Maximum
Extended
Dimension
of the hearth
extension
See section
9.2.1 and
9.2.2
3
⅝
"
(93 mm)
G = (A-C)
D=B- G
7
⅛
"
(181 mm)
Back from
fireplace
facing 1
⅜
"
Minimum
Extended
Dimension
of the hearth
extension
See section
9.2.1 and
9.2.2
2
¼
"
(57 mm)
G = (A-C)
D=B- G
8 ½"
(216 mm)
Back from
fireplace
facing 2
¾
"
If the value
(D)
is negative or zero, additional floor protection in front of the unit is not needed
because the masonry fireplace hearth extension is long enough. If the value
(D)
is positive, an
additional floor protection in front of the hearth extension at least equivalent to the result
(D)
must be added.
2.2.1 Installation Raised of 6" (152 mm) and Less
If non-combustible material floor protection needs to be added in front of and level with the
hearth extension of the masonry fireplace (F = 6" [152 mm) or less), an R-value equal to or
greater than 2.00 is required and should extend at least 27" (686 mm) in front of the unit
(B)
.
Refer to
«Additional Floor Protection - Not Raised Installation»
2.2.2 Installation Raised of More Than 6" (152 mm)
If the extension of the masonry hearth is raised at least 6" (152 mm) from the floor protection, a non-
combustible material, without an R-value, must extend at least 16" (406 mm in USA) or 18" (457 mm
in Canada) in front of the unit
(B)
. Refer to
«Additional Floor Protection - Raised Installation»
2.3 R Value
There are two ways to calculate the R-value of the floor protection. First, by adding the R-values of
materials used, or by the conversion if the K factor and thickness of the floor protection are given.
To calculate the total R value from R values of the materials used, simply add the R-values of
materials. If the result is equal to or greater than the R-value requirements, the combination is
acceptable. R-values of some selected materials are shown below.
