18
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 30 - Rear Vent - ONE 90 DEGREE ELBOW
Figure 29 - Top Vent - STRAIGHT
Figure 31
-
Top Vent - TWO 90 DEGREE ELBOWS
VERTICAL VENT FIGURES/TABLES
NOTE:
It is very important that the horizontal/
inclined run be maintained in a straight (no
dips), slightly elevated plane. The recommended
incline is approximately 1/4" per foot (20 mm
per
meter) horizontal, in a direction away from
the fireplace. The 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 (Se-
cure Flex)firestop/spacer must be used anytime
vent pipe passes through a combustible wall.
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: An elbow is acceptable as 1 foot of
vertical rise, except where an elbow is the
only vertical component in the system. (See
Figure 38 on Page 20).
NOTE:
Secure Vent
®
(rigid vent pipe) is shown
in the figures;
Secure Flex
®
(flexible vent pipe)
may also be used.
A Vent Restrictor, as shown in
Figure 19
on
Page 14
, must be used in this application.
Example:
If 8 feet of (H) horizontal vent
run is needed, then 4 feet minimum (V)
vertical vent will be required.
This table shows a 1 (V) to 2 (H) ratio.
For every 1 foot of (V) vertical, you are
allowed 2 feet of (H) horizontal run, up to
a maximum horizontal run of 8 feet.
TABLE A
H Maximum
V Minimum
feet
feet
2
(0.610)
1
(0.305)
4
(1.219)
2
(0.610)
6
(1.829)
3
(0.914)
8
(2.438)
4
(1.219)
V + H = 40 feet (12.2 meters) Max.
H = 8 feet (2.4 meters) Max.
Ratio V to H ratio is 1:2
(meters)
(meters)
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 (V) vertical, you are
allowed 5 feet of (H) horizontal run, up
to a maximum horizontal run of 20 feet.
An elbow is acceptable as 1 foot of
vertical rise except where an elbow is the
only vertical component in the system.
See
Figure 38
.
NOTE:
Install the U-shaped vent restrictor in
any vent run with more than 8 ft. of vertical
rise. See
Page 14
.
TABLE B
H Maximum
V Minimum
feet
(meters)
feet
5
(1.524)
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 + V
1
+ H = 40 feet (12.2 m) Max.
H = 20 feet (6.096 meters) Max.
(meters)
WARNING
Under no circumstances, may separate sections of concentric flexible vent
pipe be joined together.
NOTE:
Install the U-shaped vent restrictor in any vent
run with more than 8 ft. of vertical rise. See
Page 14
.
Max. 40 ft
(12.2 m)
*
When using
Secure Flex
, use
Ceiling Firestop/
Spacer
SF4.5VF
.
Ceiling
Firestop/
Spacer
SV4.5VF*
V
H
Ceiling
Firestop/Spacer
SV4.5VF*
*
When using
Secure Flex
, use
Ceiling Firestop/Spacer
SF4.5VF
.
H
V
V1
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
.
Installation and Operation Instructions
900357-00, 06/2015
Innovative Hearth Products
Superior
TM
DRT40 Direct Vent Gas Fireplace
