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6
UVSRC Vent-Free Fireboxes
20007435
A
B
B
5"
A
1/2"
C
D
1/2” Clearance
not Required at
This Point
Front View
Side View
ABCD
UVSRC36A 39¹⁄₄”44¹⁄₄” 21” 22”
UVSRC42A 45¹⁄₄”44¹⁄₄” 22” 32”
T226
Fig. 4 Framing dimensions.
The normal gas connection is 1/2" NPT, made at the left
side facing the unit. If a right side connection is desired,
the connecting pipe must be led at the rear of the
fireplace to terminate at the left hand side for connec-
tion to the fireplace.
Piping should be tested for leaks prior to final wall
installation. Test for leaks using soap and water solution
after completing the connection. DO NOT USE OPEN
FLAME.
Step 6: Optional Procedure For Cold Climate
Installations
The insulation and sealing of the enclosure around the
fireplace is very important in cold climates. If the
enclosure is insulated and sealed properly, you can
avoid future cold air problems. The time taken to install
the firebox correctly is well worthwhile. The following
steps are to stop potential cold air problems.
Insulation of the Fireplace Enclosure
When in a chase or an outside wall, the fireplace
enclosure should be insulated like any other wall of
your home. Insulation should be installed on the outside
wall(s) and the wall above the fireplace.
Insulate to Seal Under the Fireplace
Insulating under the fireplace is beneficial for installa-
tions on a concrete slab. The fireplace should be placed
on insulating board. It is important that a hard, rigid
surface be maintained, so do not use fiberglass insula-
tion for this purpose.
CAUTION: WHEN INSTALLING A FIREPLACE IN AN
INSULATED ENCLOSURE, BE SURE TO MAINTAIN
ALL MARKED AIR SPACES.
Seal Seams
Seal the seams of the fireplace where the outer wall
meets the bottom pan and the front face. Also seal
between the fireplace and finishing materials. Use high
temperature caulk. Refer to Figure 6 for details of
sealing spaces between the fireplace and finishing
materials. Note the small amount of insulation installed
across the top of the fireplace and down the sides as a
backing for the caulk.
Finishing Material
Stud
Insulation
Noncombustible Material
Caulking or Sealant
Noncombustible
Insulation
Stand-
off
Finishing Material
Caulking or Sealant
Top View
Side View
FP568
Fig. 6 Sealing spaces between fireplace and finishing
materials.
1"
Min.
Side Refractory
Fireplace
Outer Wrap
1/2” Gas Pipe
Refractory Cement
Noncombustible
Insulation
T227
Fig. 5 Gas line installation.