VERTICAL VENT FIGURES/TABLES
Note: Secure Vent (rigid vent pipe) is shown in the figures; Secure Flex (flexible vent pipe) may also be used.
WARNING: UNDER NO CIRCUMSTANCES MAY SEPARATE SECTIONS
OF CONCENTRIC FLEXIBLE VENT PIPE BE JOINED TOGETHER.
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.
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: 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.
*Ceiling
Firestop/Spacer
(SV4.5VF)
Detail View | 40 feet |
| (12.2 meters) |
| Maximum |
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| TABLE A |
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| H Maximum | V Minimum | ||
| H | feet | (meters) | feet | (meters) |
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| 5 | (1.524) | 1 | (0.305) |
| *Ceiling | 10 | (3.048) | 2 | (0.610) |
| 15 | (4.572) | 3 | (0.914) | |
| Firestop/Spacer | ||||
| (SV4.5VF) | 20 | (6.096) | 4 | (1.219) |
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| V + H = 40 feet (12.2 m) Max. | ||
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| H = 20 feet (6.096 meters) Max. | ||
| **Wall |
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V | Firestop/Spacer |
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Support
Bracket 
*When using Secure Flex, use Firestop/Spacer SF4.5VF
Note: Install second restrictor in any run having more than 8 ft. of vertical rise.
Figure 23 - Top Vent - STRAIGHT
*When using Secure Flex, | Support | |
Bracket | ||
use Firestop/Spacer | ||
SF4.5VF |
| |
**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. | ||
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.
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Figure 24 - Top Vent - TWO 90 DEGREE ELBOWS
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.