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Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
Table 26 - Rear Vent—Three 90° Elbows
H + H
+ H
Maximum
1
2
feet
meters
5
1.524
10
3.048
15
4.572
20
6.096
V + H + H
+ H
= 60 ft (18.288 m) maximum
1
2
H = 8 ft (2.438 m) maximum
H + H
+ H
= 25 ft (7.62 m) maximum
1
2
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 20 ft of (H) horizontal vent run is needed, then 4 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 20 ft (6.096 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).
Table 27 - Top Vent—Three 90° Elbows
H Maximum
feet
5
5
10
15
20
H + H
= 25 ft (7.62 m) maximum
1
V + V
+ H + H
= 60 ft (18.288 m) maximum
1
1
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 20 ft of (H) horizontal vent run is needed, then 4 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 20 ft
(6.096 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).
36
H Maximum
feet
meters
feet
2
0.610
4
1.219
6
1.829
8
2.438
V Minimum
meters
feet
meters
1.524
Elbow only
1.524
1
3.048
2
4.572
3
6.096
4
V Minimum
meters
1
0.305
2
0.610
3
0.914
4
1.219
*
When using Secure
Flex
, use ceiling
®
firestop/spacer
SF4.5VF.
**
When using Secure
Flex, use wall firestop/
spacer SF4.5HF.
0.305
0.610
0.914
1.219
Wall firestop/
Wall Firestop/Spacer
spacer SV4.5HF **
SV4.5HF**
Wall firestop/spacer
Wall Firestop/Spacer
SV4.5HF **
SV4.5HF**
H1
H
1
H2
H
2
Ceiling
Ceiling
firestop/spacer
Firestop/Spacer
SV4.5VF *
SV4.5VF*
V
V
*
When using Secure Flex
*When using Secure Flex, use
ceiling firestop/spacer SF4.5VF.
Ceiling Firestop/Spacer SF4.5VF.
**
When using Secure Flex, use wall
H1
H
**When using Secure Flex, use
1
firestop/spacer SF4.5HF.
Wall Firestop/Spacer SF4.5HF.
Ceiling
Ceiling
firestop/spacer
Firestop/Spacer
SV4.5VF *
SV4.5VF*
V1
V 1
Wall firestop/spacer
Wall Firestop/Spacer
SV4.5HF **
SV4.5HF**
Installation
900960-00D, 04/2020
H
H
, use
®
H
H
V
V
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