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14
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Note: Install second restrictor in any run
having more than 8 ft. of vertical rise.
Figure 23
- Top Vent - STRAIGHT
Figure 24
-
Top Vent - TWO 90 DEGREE ELBOWS
VERTICAL VENT FIGURES/TABLES
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.
WARNING: UNDER NO CIRCUMSTANCES MAY SEPARATE SECTIONS
OF CONCENTRIC FLEXIBLE VENT PIPE BE JOINED TOGETHER.
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.
TABLE A
H Maximum
V Minimum
feet
(meters)
feet
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 feet (6.096 meters) Max.
(meters)
40 feet
(12.2 meters)
Maximum
*
Ceiling
Firestop/Spacer
(SV4.5VF)
*
When using Secure
Flex, use
Firestop/Spacer
SF4.5VF
Support
Bracket
Detail View
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) or SF4.5HF (Secure Flex)
must be used anytime vent pipe passes through a combustible wall. For the MPLDV35/40/45, with
a center line lower than 48" (1219 mm) above the fireplace top wrapper surface, use SV4.5HF5 or
SF4.5HF5. In all cases the firestop/spacer provided with the termination may be used with the
termination, frame to 5" clearance where applicable.
Note: Secure Vent (rigid vent pipe) is shown in the figures; Secure Flex (flexible vent pipe) may
also be used.
H
*Ceiling
Firestop/Spacer
(SV4.5VF)
**Wall
Firestop/Spacer
**Use Firestop/Spacer SV4.5HF or SF4.5HF when using Secure Vent or Secure Flex respectively.
Use Firestop/Spacer SV4.5HF5 or SF4.5HF5 when using Secure Vent or Secure Flex on horizontal
vent runs for the MPLDV35/40/45 with a center line lower than 48” (1219 mm) above the fireplace
top wrapper surface. In all cases the firestop/spacer provided with the termination may be used
with the termination, frame to 5” clearance where applicable.
*When using Secure Flex,
use Firestop/Spacer
SF4.5VF
Support
Bracket
V