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INSTALLATION
MASONRY AND FACTORY BUILT FIREPLACE CLEARANCES
The minimum required clearances to combustible materials when installed into a masonry or factory built fi replace are listed below.
Adjacent
Unit
Side Wall
(to Side)
A
Medium Flush
Insert (I2400)
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.
** 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).
Thermal fl oor protection is not required if the unit is
raised 3.5" minimum (measured from the bottom of
the stove). However, standard ember fl oor protec-
tion is required. It will need to be a non-combustible
material that covers 16" (406 mm) in the US and
18" (450 mm) in Canada to the front of the unit and
8" (200 mm) to the sides.
If the unit is not raised, thermal fl oor protection
required is 18" (450 mm) in the US and Canada.
All fl oor protection must be non-combustible (i.e.,
metals, brick, stone, mineral fi ber boards, etc.) Any
organic materials (i.e. plastics, wood paper prod-
ucts, etc.) are combustible and must not be used.
The fl oor protection specifi ed includes some form
of thermal designation such as R-value (thermal
resistance) or k-factor (thermal conductivity).
FLOOR PROTECTION MATERIALS ARE ACCEPTABLE
The specifi ed fl oor 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 specifi cation
to R-value.
R = 1/k x T = 1/0.84 x .75 = 0.893.
8
Mantle**
Top
(to Top)
Facing
(to Top)
B
C
20"/508mm
12"/305mm
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
specifi ed R of 0.893. Since proposed system
R is greater than required, the system is
acceptable.
Side
Minimum
Facing
Hearth
(to Side)
Extension*
D
E
8"/200mm
18"/455mm
Clearance diagram for Installations
Minimum Hearth Extension for the front
(E) and sides (G) are measured from the
fuel door opening.
DEFINITIONS
Thermal Conductance:
C
Thermal Conductivity:
k =
(hr)(ft
Thermal Resistance:
R
Minimum
Minimum
Hearth
Hearth Side
Thickness*
Extension
F
G
0.5"/13mm
8"/200mm
=
Btu
=
W
(hr)(ft
)(
F)
(m
)(K)
2
o
2)
(Btu)(inch)
=
W
=
Btu
)(
F)
(m)(K)
(hr)(ft)(
3
o
=
(ft
)(hr)(
F)
=
(m
)(K)
2
o
2
Btu
W
Regency I2400M
F)
o
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