Masonry And Factory Built Fireplace Clearances; How To Determine If Alternate Floor Protection Materials Are Acceptable - HAMPTON BAY HI300 Owners & Installation Manual

installation
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MASONRY AND FACTORY BUILT FIREPLACE CLEARANCES

The minimum required clearances to combustible materials when installed into a masonry or factory built ireplace are listed below.
Adjacent
Side Wall
Unit (to Side of Unit)
A
Wood Cast
Insert (HI300) 11"/280mm
Side and Top facing is a maximum of 1.5" thick.
Floor protection must be non-combustible, insula-
tive material with an R value of 1.1 or greater.
* Hearth thickness of 0.5" with k value = 0.84",
r value = 0.6 or greater.
Thermal loor protection not required if unit is
raised 3.5" min. measured from bottom of stove. At
this point the standard ember loor protection will
be required. It will need to be a non-combustible
material that covers 16" (406 mm) to the front
of the unit (in Canada 18" (450 mm) and 8" (200
mm) to the sides.
All loor protection must be non-combustible (i.e.,
metals, brick, stone, mineral iber boards, etc.) Any
organic materials (i.e. plastics, wood paper prod-
ucts, etc.) are combustible and must not be used.
The loor protection speciied includes some form
of thermal designation such as R-value (thermal
resistance) or k-factor (thermal conductivity).
** A non-combustible mantel may be installed
at a lower height if the framing is made of
metal studs covered with a non-combustible
board.
** Max. mantle depth is 10" (254mm)
FLOOR PROTECTION MATERIALS ARE ACCEPTABLE
The speciied loor protector should be 3/8"
(18mm) thick material with a K - factor of
0.84.
The proposed alternative is 4" (100mm) brick
with a C-factor of 1.25 over 1/8" (3mm) mineral
board with a K-factor of 0.29.
Step (a):
Use formula above to convert speciication
to R-value.
R = 1/k x T = 1/0.84 x .75 = 0.893.
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Hampton HI300 Wood Cast Insert
Mantle** Top
(to Top of Facing
unit) (to Top of Unit)
B C
12"/305mm Reg. F/P
20"/508mm
14"/356mm O/S F/P
A
F
HOW TO DETERMINE IF ALTERNATE
Step (b):
Calculate R of proposed system.
4" brick of C = 1.25, therefore
Rbrick = 1/C = 1/1.25 = 0.80
1/8" mineral board of k = 0.29, therefore
Rmin.bd. = 1/0.29 x 0.125 = 0.431
Total R = Rbrick + Rmineral board =
0.8 + 0.431 = 1.231.
Step (c):
Compare proposed system R of 1.231 to
speciied R of 0.893. Since proposed system
R is greater than required, the system is
acceptable.
Side Minimum
Facing Hearth
(to Side of Unit) Extension
D E
8"/200mm Reg. F/P
18"/455mm
11"/279mm O/S F/P
B
Clearance Diagram for Installations
Minimum Hearth Extension for the front (E) and sides
(G) are measured from the fuel door opening.
DEFINITIONS
Minimum Minimum
Hearth Hearth
Thickness* Extension
F Side
G
0.5"/13mm 8"/200mm
C
D
G
Thermal Conductance:
C = Btu =
(hr)(ft )( F)
2 o
Thermal Conductivity:
k = (Btu)(inch) = W =
(hr)(ft )( F) (m)(K)
3 o
Thermal Resistance:
)(hr)( F) =
R = (ft 2 o
Btu
From Top of
Unit
H
21-1/2"/546mm
E
W
(m )(K)
2)
Btu
(hr)(ft)( F)
o
(m )(K)
2
W