Section 3: Finishing; Fireplace Screw Locations; Back Framing - Montigo R320-ST Installation & Maintenance Manual

Step 1: Remove screws from perimeter of glass as shown
below. The screws will be used to fasten the cement board,
provided by Montigo, to the unit in the finishing stages. Remove
the marked screws above and below the glass. Place provided
Figure 3a. R320 Fireplace Screw Locations. Both Sides are Typical.
Figure 3b. R420 Fireplace Screw Locations. Both Sides are Typical.
Step 2. Back-framing the Fireplace; installing 2 x 4's, (Typical Both
sides). Ensure you have the required 2 x 4's to complete the project.
Cut Four (4) - 2 x 4's to fit under the front & rear fireplace throat,
(horizontal), fit & remove. These must be no closer than 3" below
the bottom edge of glass. Next, cut the short 2 x 4's, to fit at each
end under the previous Horizontals.
Non-combustible Header
(Supplied by Montigo)
First wood header installed
at 19" from top of glass
3" Clearance to
combustibles
First
combustible
(2) 2X4s
3" Clearance
to combustibles
Figure 3c. Fireplace installation, (Ensure you maintain the 3" clearance to combustibles) Both Sides are Typical.
XG0772 - 030711
Installation
Front View
Front View
2 X 4, (Top
Space between
2 x 4s
Horizontal)
R320 = 47½"
R420 = 59½"
2 X 4 fillers, (Vertical) use typical
building practices when spacing
R320-ST & 420 ST Power Vent Indoor Gas Fireplace
template to check screw hole positioning. Transfer template to
provided cement board to pre drill pilot holes. Refer to figures
below for Screw locations.
R320
3 Screws Top
&
3 Screws
Bottom
Side View
R420
4 Screws Top
&
4 Screws
Bottom
Side View
Next, cut the required quantity of short filler 2x4's under the lower
Horizontal. The number of pieces will be determined by the length,
and model of fireplace. (Follow Typical building codes and practices
when spacing). Next, cut the Required Left and Right Vertical 2 x 4's
and space at 3" from side of apron. Install the Two (2) Non-combustible
Headers, supplied by Montigo (one (1) per side).
2 X 4, (Bottom 2-pcs 2 x 4, (vertical)
Horizontal) Both Sides Typical
3" Clearance
to combustibles

Section 3: Finishing

Space supplied
Non-Combustible Header(s)
to allow 6" of Cement board
to be fastened to
1"
Clearance
1"
Clearance
Both
Sides
Typical
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