Installation
900683-01F, 10/2018
Innovative Hearth Products
DRT3500 Series Direct-Vent Gas Fireplaces
16
Wall Finishes / Surrounds / Mantels
NOTE: Combustible wall finish materials and/or surround materials must not be allowed to encroach the area defined
by the fireplace front face (black sheet metal). Never allow combustible materials to be positioned in front of or
overlapping the fireplace face (Figure 36, Page 45).
Non-combustible materials, such as surrounds and other fireplace trim, may be installed on the fireplace face, but they
must not cover any portion of the removable glass panel or control compartment.
Vertical installation clearances to combustible mantels vary according to the depth of the mantel (Figure 6). Mantels
constructed of non-combustible materials may be installed at any height above the fireplace opening. However, do
not allow anything to hang below the fireplace hood.
Minimum clearance requirements include any projections such as shelves, window sills, mantels, etc. above the
fireplace.
NOTE: To avoid heat-related finish damage, we recommend the use of high temperature paint (rated 175° F or higher) on
the underside of the mantel.
INSTALLATION PREPARATION
The fireplace is shipped with all gas controls and components installed and pre-wired. Before installing the fireplace,
follow these steps:
1. Remove the shipping carton, and retain the front of the carton (used to protect the fireplace during construction).
2. Remove the shipping pad, exposing the front glass door.
3. Remove the glass door (Pages 59–60).
NOTE: Place the glass door on the shipping carton to protect its surface.
Figure 5 - Combustible Side Clearances
Figure 6 - Mantel Height
3-1/2”
(89 mm)
6”
(152 mm)
Top View of
Fireplace
45
o
Combustible mantel legs may
project beyond either side
of the fireplace opening
as long as they are kept
within the shaded area
illustrated here.
Combustible Materials
Allowed In Shaded Area
“Safe Zone”
Combustible Walls
shown in dark gray
At 6” minimum
side wall clearance,
a combustible wall
can project to any
length.
Top View of
Fireplace
45
o
6” (152
mm)
Combustible materials
allowed in shaded area
“Safe Zone”.
Combustible walls
shown in dark gray
Combustible mantel
legs may project
beyond either side of
the fireplace opening
as long as they are kept
within the shaded area
illustrated here.
At 6” minimum
side wall
clearance, a
combustible
wall can project
to any length.
3-1/2” (89
mm)
12
(305)
10
(254)
8
(203)
6
(152)
4
(102)
2
(51)
in. (mm)
10 (254)
12 (305)
14 (356)
16 (406)
18 (457)
20 (508)
Hood
Fireplace
Mantel depth
