24
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Installation and Operation Instructions
900300-00, 01/2018
Innovative Hearth Products
DRT35ST and DRT35PF Direct-Vent Gas Fireplaces
Venting Components Required for Various Exterior Wall
Thicknesses, when using Typical Termination Kits
Vent Components Required Exterior Wall Thickness - inches (mm)
Termination Kit Only
6 to 9-1/4 (152 to 235)
Termination Kit and 6" Vent
Section (SV4.5L6)
10-3/4 to 14 (273 to 356)
Termination Kit and 12" Vent
Section (SV4.5L12)
16-3/4 to 20 (426 to 508)
Termination Kit and Tele-
scopic Section (SV4.5LA)
and 6” vent section (SV4.5L6)
11-3/4 to 20 (299 to 508)
Table 8
NOTE: See Figure 36 showing wall thickness range
when using SV4.5HT-2 termination kit.
HORIZONTAL VENT FIGURES/TABLES
NOTE:
Secure Vent
®
components (rigid vent pipe and terminal) are
shown in the figures;
Secure Flex
®
components (flexible vent pipe and
terminal) may also be used.
NOTE:
Two 45 degree elbows may be used in place of one 90 degree
elbow. The same rise to run ratios, as shown in the venting figures for
90 elbows, must be followed if 45 degree elbows are used.
NOTE: It is very important that the horizontal/inclined run be maintained
in a straight (no dips) and recommended to be in a slightly elevated
plane, in a direction away from the fireplace of
1/4" rise per foot (20
mm per meter) which is ideal, though rise per foot run ratios that are
smaller are acceptable all the way down to at or near level.
NOTE:
SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) firestop/spacer
must be used anytime vent pipe passes through a combustible floor or
ceiling. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) firestop/spacer
must be used anytime vent pipe passes through a combustible wall.
u
Wall Firestop / Spacer
(SV4.5HF)
H = 28 in. (711 mm)
Maximum
7 in. (711 mm)
21 in. (533 mm)
Maximum
u
When using
Secure Flex, use
Firestop / Spacer
SF4.5HF
See Table 8 as an aid in venting component selection for a particular range
of exterior wall thicknesses.
Square
termination
(SV4.5HT-2)
shown
Figure 37
- Side Vent, NO ELBOWS
H
V
v
Wall Firestop/Spacer
(SV4.5HF)
Table F
H Maximum
V Minimum
feet
(meter)
feet
(meter)
3
(0.914)
Elbow Only
5
(1.524)
1
(0.305)
10
(3.048)
2
(0.610)
15
(4.572)
3
(0.914)
20
(6.096)
4
(1.219)
V + H = 40 feet (12.2 m) Max.
H = 20 ft. (6.096 m) Max.
Example:
If 20 feet of (H) horizontal vent run is needed, then 4 feet
minimum of (V) vertical vent will be required.
This table shows a 1(V) to 5(H) ratio. For every 1 foot of vertical, you are
allowed 5 feet of (H) horizontal run up to a maximum (H) horizontal run
of 20 feet.
u
When using Secure Flex, use Firestop / Spacer SF4.5VF
v
When using Secure Flex, use Firestop / Spacer SF4.5HF
Figure 38
-
Top Vent, ONE 90 DEGREE ELBOW
See Table 8 as an aid in venting component
selection for a particular range of exterior wall
thicknesses.
Square termination (SV4.5HT-2)
shown.
WARNING
Under no circumstances, may separate sections of
concentric flexible vent pipe be joined together.
