Osburn 1700-I, Installation And Operation Manual

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Page 31 Installation and Operation Manual - Osburn 1700-I
ENGLISH
To determine the need to add floor protection (D) beyond the hearth extension (A) , the following
calculation must be done using the data in «Table 4 : Data for Floor Protection Calculation» of
this section: D = B - G, where G = A-C.
HEARTH SLAB:
NON-COMBUSTIBLE MATERIAL
FLOOR PROTECTOR:
NON-COMBUSTIBLE MATERIAL
B
C
D
E
F
A
G
HEARTH SLAB:
NON-COMBUSTIBLE MATERIAL
FLOOR PROTECTOR:
NON-COMBUSTIBLE MATERIAL
B
C
D
E
F
A
G
Figure 22: Additional Floor Protection - Raised Installation Figure 23: Additional Floor Protection - Not Raised Installation
Table 4 : 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.
9.2.1 Installation Raised of 4" (102 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 = 4" [102 mm) or less), an R-value equal to or
greater than 1.00 is required and should extend at least 22" (559 mm) in front of the unit
(B) .
Refer to «Figure 23: Additional Floor Protection - Not Raised Installation»
9.2.2 Installation Raised of More Than 4" (102 mm)
If the extension of the masonry hearth is raised at least 4" (102 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 «Figure 22: Additional Floor Protection - Raised Installation» .