Installation
900005-00, 10/2015
Innovative Hearth Products
Envy™ Direct-Vent Gas Fireplaces
26
Figure 20 - Top Vent-Straight
Table 15 - Top Vent—Two 90° Elbows
Table 16 - Top Vent—Three Elbows
Ceiling
firestop/
spacer
SV4.5VF *
When using
Secure Flex
®
,
use ceiling
firestop/spacer
SF4.5VF.
*
60 ft (18.3 m)
maximum
Ceiling firestop/
spacer SV4.5VF
*
Wall firestop/
spacer SV4.5HF
**
When using Secure Flex
®
, use
ceiling firestop/spacer SF4.5VF.
When using Secure Flex, use
wall firestop/spacer SF4.5HF.
*
**
V1
H
V
Ceiling firestop/
spacer SV4.5VF
*
Wall firestop/
spacer
SV4.5HF **
V1
H
V
H1
When using Secure Flex
®
, use
ceiling firestop/spacer SF4.5VF.
When using Secure Flex, use
wall firestop/spacer SF4.5HF.
*
**
H + H
1
Maximum
V Minimum
H Maximum
V Minimum
feet
meters
feet
meters
feet
meters
feet
meters
5
1.524
1
0.305
5
1.524
2
0.610
10
3.048
2
0.610
10
3.048
3
0.914
15
4.572
3
0.914
15
4.572
4
1.219
20
6.096
4
1.219
20
6.096
5
1.524
H + H1 = 20 ft (6.1 m) maximum
V + V1 + H + H1 = 60 ft (18.3 m) maximum
Install the U-shaped vent restrictor
in any vent run with more than 6 ft of
vertical rise. See Page 21 for more
information.
V + V
1
+ H = 60 ft (18.3 m) maximum
H = 20 ft (6.096 m) maximum
Install the U-shaped vent restrictor in any vent run with
more than 6 ft of vertical rise. See Page 21 for more
information.
If 20 ft of (H) horizontal vent run is needed, then
4 ft (straight section) 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.
An elbow is acceptable as 1 ft of vertical rise, but
may not be connected directly to the appliance
vent collar.
Install the U-shaped vent restrictor in any vent run with
more than 6 ft of vertical rise. See Page 21 for more
information.
If 20 ft of (H) horizontal vent run is needed, then
4 ft (straight section) 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.
An elbow is acceptable as 1 ft of vertical rise,
but may not be connected directly to the
appliance vent collar.
NOTE:
The vent system may have a maximum
of three (3) 90° elbows.
Vertical Vent Figures/Tables
NOTE:
Secure Vent
®
rigid vent pipe is shown in the figures; Secure Flex
®
flexible vent pipe may also be used.
NOTE:
Rise per foot run ratios are acceptable all the way to level. For best results, maintain the horizontal/inclined
run in a straight (no dips), slightly elevated plane of approximately 1/4” per 1 ft (20 mm per 1 m).
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.
NOTE:
Two (2) 45° elbows may be used in place of one (1) 90° elbow. The same rise to run ratios, as shown in the
venting figures for 90° elbows, must be followed if 45° elbows are used.
NOTE:
An elbow is acceptable as 1 ft of vertical rise, but may not be connected directly to the appliance vent collar.
WARNING
Do NOT join separate sections of concentric flexible vent pipe.
