Astria Inglenook CLP2 Installatie- en bedieningshandleiding - Pagina 6

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HEARTH EXTENSION
A hearth extension projecting a minimum of 20" in front of and a
minimum of 12" beyond each side of fireplace opening is required
to protect combustible floor construction in front of fireplace. Fab-
ricate a hearth extension using a material which meets the following
specifications: a layer of noncombustible, inorganic material having
a thermal conductivity of k = .84 BTU IN/FT
thick. For example, if material selected has a k factor of 0.25, such
as glass fiber, the following formula would apply:
0.25 x 1.0" = 0.30" thickness required
0.84
Thermal conductivity "k" of materials can be obtained from manu-
facturer or supplier of noncombustible material. If hearth extension
is to be covered, use noncombustible material such as tile, slate,
brick, concrete, metal, glass, marble, stone, etc. Provide a means to
prevent hearth extension from shifting and seal gap between fireplace
frame and hearth extension with a non-combustible material such
as sand-cement grout (see Figure 3, page 5).
WARNING: Hearth extension is to be installed
only as shown in Figure 5.
Ember Protector
Do Not Block Louver
Figure 5- Hearth Extensions
MANTEL CLEARANCES
Woodwork such as wood trims, mantels or any other combustible
material must not be placed at least 9" above opening of fireplace
(see Figure 6, page 6). Combustible materials above 9" and projecting
more than 1 1/2" from the fireplace front face must not be at least
12" above fireplace opening (NFPA 211, Section - Clearance from
Combustible Material).
Mantels or any other combustible material may also come up to the
side edge of the black metal face of the fireplace. Clearances from
side of fireplace to any combustible material and wall should fall
within the limits show in Figure 7.
6
FIREPLACE INSTALLATION Continued
HR °F (or less) at 1"
2
Seal Cap
Hearth
Extension
Seal Cap
Hearth
Extension
Ember
Protector
www.Astria.US.com
12
/
" Ref.
1
4
6"
Ref.
33°
3" Nom.
1
/
" Max.
1
12" Min.
2
9" Min.
Fireplace Opening
Figure 6 - Mantel Clearances
Example 1: The face of a mantel, bookshelf, etc. is made of combus-
tible material and protrudes 2
is installed. The combustible material must be a minimum of 4" from
side of fireplace opening.
Example 2: The face of a mantel, bookshelf, etc. is made of com-
bustible material and protrudes 11/16" from the wall on which the
fireplace is installed. The combustible material can butt up against
side of fireplace (i.e. 1" from fireplace opening).
No Combustible
Material on Face
Example 1
of Firebox
Example 2
Fireplace
Opening
1" Both
Sides
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Minimum 14" from Perpendicular Side Wall
Figure 7 - Minimum side clearances
Combustible
Material
Safe
Zone for
Projection of
Combustible
Materials
Upper
Section of
Fireplace
/
" from the wall on which the fireplace
3
4
9
8
8
7
6
6
5
4
4
3
2
2
1
11/16
5
/
8
/
15
16
/
1
4
/
9
16
/
7
8
/
3
16
/
1
2
/
13
16
/
1
8
7
/
16
/
3
4
/
1
16
3
/
8
126647-01A