Glass Doors; Cold Climate Insulation; Fireplace Finishes; Mantels And Trim - Intertherm DESIGNER 36 Installation Instructions Manual

36" wood burning fireplaces
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Glass Doors

Glass doors have been installed on these
fireplaces as standard equipment. Shipping
and transit may have moved them out of
alignment.
The doors are properly adjusted when the top
door trim is in a straight, level line and the gap
between the doors is even at the top and
bottom. If adjustments are required, grasp the
door handle and loosen the lower door pivot
pin using a ³⁄₈" open end wrench*. Slide the
door panel on the hinge pin until the gap
between the upper door trim and upper frame
is even. Retighten the lower door pivot pin*.
Repeat this procedure for the opposite door if
needed ( Figure 43 ).
Spring Clip
Pivot Pin
Figure 43
*Note: Upper door pivot pins can also be loos-
ened for adjustment purposes; however, it is
easier to loosen lower pins.

COLD CLIMATE INSULATION

If you live in a cold climate, it is especially
important to seal all cracks around the fire-
place opening with noncombustible material
and wherever cold air could enter the room.
Surrounding materials must be caulked where
it meets the black metal facing of the fireplace
to avoid cold air intrusion. Use noncombus-
tible caulking material only on fireplace facing
to seal. Also, the outside air inlet duct should
be wrapped with noncombustible insulation to
minimize the formation of condensation. Do
not place insulation materials on top of fire-
place or against chimney sections.
Note: A 2" air space must be preserved for all
combustible materials extending for any con-
tinuous length adjacent to the chimney.
16
It is especially important to insulate between
the studs of an outside chase cavity and under
the floor if the floor is above ground level. Do
not place insulation directly against the fire-
place or chimney system.

FIREPLACE FINISHES

Mantels and Trim

It is sometimes best to frame your fireplace
after it is positioned and the chimney is in-
stalled. Frame enclosure for chimney and fire-
place with 2 x 4's (or heavier) lumber.
Note: The header may rest on the two (2) metal
top spacers on top of the unit but the header
must not be notched to fit around the spacers.
These fireplaces may sit directly on a combus-
Upper Door
Guide Track
tible surface. A 2" air space is required between
combustible framing and the chimney. A 1" air
Roller
space is required between combustible fram-
Pin
ing and fireplace outer wrapper. Combustible
mantels and trim may be installed 12" above the
fireplace opening as per NFPA 211, Section 7-
2.3.3. and Figure 44 . If a mantel is of a noncom-
bustible material, it is exempt from these re-
quirements as long as it does not interfere with
the installation or operation of glass doors.
Combustible
Mantel
and Trim
12"
Min.
Figure 44
Hearth Extensions and Wall Shields
A hearth extension must be installed with
all fireplaces. It is to protect the combustible
floor in front of the fireplace from both radiant
heat and sparks.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Header
12"
Max.
1 1/2"
Spacer
Finished
Wall
9"
Fireplace
Opening
Typical Installation
The hearth extension must extend 8" beyond
both sides of the fireplace opening and 16"
beyond the front ( Figure 45 ). Use a hearth
extension constructed of a durable noncom-
bustible material having an equal or greater
insulating value of k = .84BTU/In Hr Ft
a thermal resistance that equals or exceeds
Hr °F /BTU. With these values,
2
r = 1.19 In Ft
determine the minimum thickness/material
required using the formula and the Table on
page 17.
Note: Any noncombustible material whose k
value is less than .84 or whose r value is more
than 1.19 is acceptable.
If the fireplace is installed on a combustible
floor, use the metal safety strips (provided)
on the floor extending half under the fireplace
and half under the hearth extension (refer to
Figures 6 and 7 ).
A wall shield is required where a continuous
perpendicular side wall is within 12" of the
fireplace opening, ( see Figure 46 ). Use a 24"
W x 30" H wall shield constructed of millboard
or a durable, noncombustible material having
an equal or greater insulating value than K =
HR °F. At no time may a
2
.54BTU/IN FT
perpendicular side wall be closer than 7".
If fireplace is installed diagonally across a 90°
corner; no wall shields are required.
C
B
D
Hearth Extension Dimensions
A
B
C
D
Figure 45
°F or
2
C
A
16"
33"
8"
49"

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