10
GCUF/GRUF Vent-Free Fireboxes
Monessen • GCUF/GRUF Owner Manual • 71D0530 • Rev G • 01/20
FIREPLACE and CANOPY INSTALLATION
When finishing a custom cabinet, mantel, or other built-in
enclosure, the opening size to accommodate the fireplace
with trim installed is as follows:
Figure 10 -
Custom Cabinet
A
B
FP2694
custom cabinet
GCUF32C GCUF36C GCUF42C
Ref.
w/Trim w/Trim w/Trim
A
37
7
⁄
8
" 41
7
⁄
8
" 47
7
/
8
"
B
35
7
⁄
8
" 35
7
⁄
8
" 35
7
⁄
8
"
INSTALLING CANOPY
A canopy is furnished with each firebox and MUST be
installed for safe operation.
Figure 11
1. Align the canopy with the holes in the top frame.
2. Secure the screws as shown.
3. Tighten side screws. Make sure the canopy is level and
secure.
Figure 11 -
Installing Canopy
FP2451
install canopy
Screws
Canopy
FP2451
WARNING!
The firebox canopy must not be modified or
replaced with a canopy that may be provided
with the unvented decorative room heater.
WARNING!
Close fireplace screen panel before operating a
decorative type unvented room heater.
1. Bend out the nailing flanges located on each side of the
firebox.
2. Slide the firebox into prepared framing or position firebox
in its final position and frame later.
3. Level the firebox by checking the top edge of the firebox.
Shim if necessary.
4. Anchor firebox to the side framing members using 8d
nails or other suitable fasteners.
Figure 9.
5. The canopy must be installed for safe operation of the
heater.
FP2902
nailing flanges
Nail Sides Through
Nailing Flanges
FP2902
Figure 9 -
Location of Nailing Flanges
