Montigo R320-ST Installation & Maintenance Manual page 11

Step 3. As shown in Figure 4; Use Cement Board, supplied by
Montigo, to overlap the new 2 x 4's and Non-combustible Header
(front & rear face). Attach on all sides of the glass, allowing 1/8"
clearance from the rim of the fireplace opening. Top piece attaches
Sheet metal screws to attach Non-Combustible
Cement board to Steel header, (supplied by Montigo)
Pre-drill for sheet metal screws to fasten
cement board to framing
Clearance required
for expansion of the
fireplace when
in operation
Fasten cement board to unit using
screws removed from unit existing
screw holes, and predrilled holes
using sheet metal screws.
Figure 4 Sec.3 Non-combustible Cement Board the Fireplace, (supplied by Montigo) Both Sides Typical.
Step4. As shown in Figure 5; Cut standard Drywall / Wall board to
complete the installation of Both surrounds.
Figure 5 Sec.3 Fireplace installation (Cut the remainder of Drywall / Wall board to complete the fireplace surrounds) Both Sides Typical.
XG0774 - 150121
Installation
Pre-drilled holes Top and Bottom using template for sheet meta
screws to fasten cement board to unit using previous screw holes
Combustible Drywall / Wallboard
or Equivalent (Top, Bottom & Sides)
R320-ST & R420-ST Power Vent Indoor Gas Fireplace
to non combustible header and fireplace. Bottom piece attaches to
fireplace and combustible horizontal framing member. Side pieces
attach to vertical 2x4s.
Non-Combustible cement board,
(Supplied by Montigo) or Equivalent
Height
Fasten Cement Board to Non-Combustible
Header using sheet metal screws and Unit,
using screws removed in step 1 (see gures 1
and 2 in Section 3 on page 10).
Fasten Cement Board to Unit, using screws Fasten Cement Board to Unit, using screws
removed in step 1 (see gures 1 and 2 in removed in step 1 (see gures 1 and 2 in
Section 3 on page 10), and to combustible Section 3 on page 10), and to combustible
cross members. cross members.
Note: Images are shown without screens for
clarity purposes. However, your fireplace should
not be operated without proper installation of
screens.
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