Installation
900960-00C, 06/2019
Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
35
Table 23 - Top Vent—One 90° Elbow, Elbow Connection NOT at Fireplace
H Maximum
V Minimum
feet
meters
feet
meters
5
1.524
1
0.305
10
3.048
2
0.610
15
4.572
3
0.914
25
7.62
5
1.524
Install the U-shaped vent restrictor in any vent run with more than 4 ft of vertical rise. See
Page 22
for more information.
See
Table 20
as an aid in venting component selection for a particular range of exterior wall thicknesses.
If 25 ft of (H) horizontal vent run is needed, then 5 ft minimum of (V) vertical vent will be required.
This table shows a 1 (V) to 5 (H) ratio. For every 1 ft of (V) vertical, you are allowed 5 ft of (H) horizontal
run, up to a maximum horizontal run of 25 ft (7.62 m).
NOTE
: If SV4.5HTSS termination is used (for 35” models only); the Wall Heatshield provided
shall be installed per instructions on
Page 32
(see instruction #12 and
Figure 25A
).
H
V
When using Secure Flex,
use Firestop/Spacer
SF4.5VF.
Ceiling
Firestop/Spacer
(SV4.5VF)
When using Secure Flex,
use Firestop/Spacer
SF4.5HF.
Wall Firestop/Spacer
(SV4.5HF)
Min. One
Foot Vent
Section
Required
When using Secure Flex
®
, use
ceiling firestop/spacer SF4.5VF.
When using Secure Flex, use
wall firestop/spacer SF4.5HF.
*
**
Wall firestop/
spacer SV4.5HF **
Ceiling
firestop/
spacer
SV4.5VF *
H
V
Table 24 - Rear Vent—Two 90° Elbows
H + H
1
Maximum
H Maximum
V Minimum
feet
meters
feet
meters
feet
meters
5
1.524
2
0.610
1
0.305
10
3.048
4
1.219
2
0.610
15
4.572
6
1.829
3
0.914
25
7.62
10
3.048
5
1.524
V + H + H
1
= 60 ft (18.288 m) maximum
H = 8 ft (2.438 m) maximum
H + H
1
= 25 ft (7.62 m) maximum
Install the U-shaped vent restrictor in any vent run with more than 4 ft of vertical rise. See
Page 22
for more information.
See
Table 20
as an aid in venting component selection for a particular range of exterior wall thicknesses.
If 25 ft of (H) horizontal vent run is needed, then 5 ft minimum of (V) vertical vent will be required.
This table shows a 1 (V) to 5 (H) ratio. For every 1 ft of (V) vertical, you are allowed 5 ft of (H) horizontal
run, up to a maximum horizontal run of 25 ft (7.62 m).
NOTE
: If SV4.5HTSS termination is used (for 35” models only); the Wall Heatshield provided
shall be installed per instructions on
Page 32
(see instruction #12 and
Figure 25A
).
*When using Secure Flex , use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
Wall Firestop/
Spacer
SV4.5HF**
Ceiling
Firestop/Spacer
SV4.5VF*
®
V
H
H1
When using Secure Flex
®
, use
ceiling firestop/spacer SF4.5VF.
When using Secure Flex, use
wall firestop/spacer SF4.5HF.
*
**
Wall firestop/
spacer
SV4.5HF **
Ceiling
firestop/
spacer
SV4.5VF *
H
V
H1
Table 25 - Top Vent—Two 90° Elbows
H + H
1
Maximum
V Minimum
feet
meters
feet
meters
3
0.91
Elbow only
5
1.524
1
0.305
10
3.048
2
0.610
15
4.572
3
0.914
25
7.62
5
1.524
V + H + H
1
= 60 ft (18.288 m) maximum
H + H
1
= 25 ft (7.62 m) maximum
Install the U-shaped vent restrictor in any vent run with more than 4 ft of vertical rise.
See
Page 22
for more information.
See
Table 20
as an aid in venting component selection for a particular range of exterior wall
thicknesses.
If 25 ft of (H) horizontal vent run is needed, then 5 ft minimum of (V) vertical vent will be
required.
This table shows a 1 (V) to 5 (H) ratio. For every 1 ft of (V) vertical, you are allowed 5 ft of (H)
horizontal run, up to a maximum horizontal run of 25 ft (7.62 m).
NOTE
: If SV4.5HTSS termination is used (for 35” models only); the Wall Heatshield
provided shall be installed per instructions on
Page 32
(see instruction #12 and
Figure 25A
).
V
H
H1
Wall Firestop/Spacer
(SV4.5HF)
When using Secure Flex,
use Firestop/Spacer
SF4.5HF.
Ceiling
Firestop/Spacer
(SV4.5VF)
Note - When using
Secure Flex
TM
, use
Firestop/Spacer SF4.5VF.
Wall
Firestop/Spacer
(SV4.5HF)
Min. One Foot Vent
Section Required
When using Secure
Flex
®
, use ceiling
firestop/spacer
SF4.5VF.
When using Secure
Flex, use wall
firestop/spacer
SF4.5HF.
*
**
Wall firestop/
spacer
SV4.5HF **
Ceiling firestop/
spacer SV4.5VF *
H
V
H1
Wall firestop/spacer
SV4.5HF **
