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Innovative Hearth Products
DRT35ST and DRT35PF Direct-Vent Gas Fireplaces
MINIMUM CLEARANCES TO COMBUSTIBLES
Appliance And Vent Clearances
The appliance is approved with zero clearance to combustible materials on all sides (as detailed
in Table 5), with the following exception: When the unit is installed with one side flush with a
wall, the wall on the other side of the unit must not extend beyond the front edge of the unit.
In addition, when the unit is recessed, the side walls surrounding the unit must not extend beyond
the front edge of the unit (see Figure 2, page 8).
*NOTE: 3" (77 mm) above any horizontal/inclined vent component.
**NOTE: See Page 13, Step 1 for clearance requirements to the nailing flange located at each
side of the unit and any screw heads adjacent to it.
Mantel Depth
19 (483)
17 (432)
15 (381)
13 (330)
11 (279)
9 (289)
12
10
8
(305)
(254)
(203)
Front or Rear Face
of Appliance
Figure 6 -
Minimum Mantel Clearances
Do not insulate this space
above the appliance.
Shelf Height
(see table)
Shelf Above Fireplace With Side Venting
Model No.
Side Vent - Straight Out Back
Secure Vent
ST/PF
37-1/4 (947)
* Includes 3" clearance to combustibles (required above vent components)
Figure 7 -
Shelf Height Minimum Clearances
5" Standoff
Top of
Appliance
6
4
2
(152)
(102)
(51)
Do not insulate this space
above the appliance.
Shelf Height
(see table)
Shelf Above Fireplace With Top Venting
Shelf Height - Inches (millimeter)
Top Vent - with One 90 Degree Elbow
& Secure Flex
Secure Vent
®
®
49-1/2 (1258)*
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
inches (millimeters)
Secure Flex
51-1/4 (1302)*
Installation and Operation Instructions
900300-00, 01/2019
Hearth Extension
- A hearth extension is not
required with this appliance. If a hearth exten-
sion is used, do not block the lower control
compartment door. Any hearth extension used
is for appearance only and does not have to
conform to standard hearth extension instal-
lation requirements.
Shelf Height -
To provide for the lowest pos-
sible shelf surface, use the alternate rear vent
outlet, the venting attached to the top vent should
be routed in a way to minimize obstructions to
the space above the appliance. Do not insulate
the space between the appliance and the area
above it (see Figure 7). The minimum height
from the base of the appliance to the underside
of combustible materials used to construct a
utility shelf in this fashion is shown in Figure 7.
The appliance should be mounted on a fully
supported base extending the full width and
depth of the unit. The appliance may be located
on or near conventional construction materials.
However, if installed on combustible materials,
such as carpeting, vinyl tile, etc., a metal or
wood barrier covering the entire bottom surface
must be used.
Wall Finishes / Surrounds / Mantels
NOTE: Combustible wall finish materials and/
or surround materials must not be allowed to
encroach the area defined by the appliance front
face (black sheet metal). Never allow combus-
tible materials to be positioned in front of or
overlapping the appliance face (see Figure 60
on Page 36).
Minimum clearance requirements include any
projections such as shelves, window sills, man-
tels, etc. above the appliance.
Non-combustible materials, such as surrounds
and other appliance trim, may be installed on
the appliance face with these exceptions: 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 man-
tel. See Figure 8, page 12. Mantels constructed
of non-combustible materials may be installed
at any height above the appliance opening;
however, do not allow anything to hang below
the fireplace hood.
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.
11
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