7
WinterWarm Small Insert
2000888
The approved construction of a floor protector calls
for a minimum of 24 gauge galvanized sheet metal or
equivalent such as 7/16” Durock
®
or Wonderboard
®
or
other listed floor protector. The floor protector may be
covered with a noncombustible decorative material if
desired.
Custom-made floor protectors may be used if they
offer the same protection as the approved floor protec-
tor described in the preceding paragraph. Durock
®
or
Wonderboard
®
have a standard K value of 0.84. Cus-
tom-built floor protectors must have a K value equal to,
or less than 0.84, meaning that heat will transfer at the
same rate or more slowly than the tested standard.
To calculate the thickness required for an alternate
material to result in a K value of 0.84, first determine
the alternate material’s K factor. This information should
be available from your local building supply yard. Then,
use the following formula to calculate the value:
NEW
required
thickness
K of new material (per inch)
K of listed material (per inch)
thickness
of listed
material
=
x
IWF291
MBUF
6/19/96
(K factor
of alternate
material)
(0.84)
X (7/16" [11mm]) =
(Required thickness of
alternate material)
(5.0)
(0.84)
X (7/16" [11mm]) = 2.6" (65mm)
Let’s use brick as an example, since it is a commonly
used hearth material. Its K factor is 5.0.
That is, when using brick for the hearth extension, the
brick must be a minimum of 2.6” (65mm) thick. Once
you know the K factor of a given material, you can use
this same formula to calculate its required thickness for
approved hearth protection.
The WinterWarm Small Insert has two leveling screws
at the front to accomodate hearth irregularities.
optional Surround packages
Custom-made surround panels may be made from any
noncombustible material.
MHSC offers both steel and cast iron Surround panel
kits, each in two sizes.
enclosure area
Steel Surround Trim kits:
6”, #2970 .........................36
¹⁄₂
” x 27” (927 x 686 mm)
10”, #2971 .....................44
¹⁄₂
” x 31” (1130 x 787 mm)
cast Iron Surround Trim kits:
7”, #2972 ......................40” x 28
¹⁄₂
” (1016 x 724 mm)
10”, #2973 .......................45” x 31” (1143 x 787 mm)
Installing the WinterWarm Small Insert
The hardware bag included with your WinterWarm
contains the Draw-down assembly components that
provide a means to secure the chimney connector to
the Insert. Be sure you have the following items:
1, 1/4-20 x 6
³⁄₄
” Threaded Rod (A)
2, 1/4” Washers (B)
2, Hex Head Nuts (C)
1, 1/4-20 x 2” Hook (D)
1, 1” x 6” Steel Bar (E)
1, 1/4-20 Wing Nut (F)
1. Remove or Disable the Fire-
place Damper.
If codes allow, remove the damper. Many dampers can
be removed simply by removing a cotter pin and/or a
set screw.
If it is not permissible or possible to remove the damper,
secure the damper in the fully open position.
~ NoTe: caNaDIaN INSTallaTIoNS ~
In accordance with caN/cSa b365-M91, you must
permanently secure the Fireplace Modification Tag
to the rear of the fireplace cavity
if you have modi-
fied the fireplace in any way to accommodate instal-
lation of a fireplace insert.
This tag is in the hardware
bag included with your Insert.
2. Install the chimney connector System.
Be sure
any chimney connector or adapter is properly in-
stalled and secured in place.
A
B
C
D
E
F
FP1096
WWsi
pull down parts
4/01
A
B
C
FP1095
WWsi
Hearth
4/3/01 djt
B
United States
canada
A. 16“ (410 mm)
18” (460 mm)
B. 8” (203 mm)
8” (203 mm)
C. 41” (1040 mm) 41” (1040 mm)
FP1095
Fig. 5
Unless your fireplace and hearth are constructed over
a dirt floor (or unpainted concrete over dirt), you must use a
floor protector that satisfies the above requirements.
Shadow
Tray