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: 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), 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.
| TABLE A |
|
| ||
H Maximum | V Minimum | *Ceiling | |||
feet | (meters) | feet | (meters) | Firestop/Spacer | |
(SV4.5VF) | |||||
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 | |
V + H = 40 feet (12.2 meters) Max. |
| ||||
| H = 8 feet (2.4 meters) Max. |
| |||
| Ratio V to H ratio is 1:2 |
| |||
Example: If 8 feet of (H) horizontal |
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vent run is needed, then 4 feet mini- |
| ||||
mum (V) vertical vent will be required. | H | ||||
This table shows a 1 (V) to 2 (H) ratio. | *When using Secure Flex, | ||||
use Firestop/Spacer | |||||
For every 1 foot of (V) vertical, you are | |||||
SF4.5VF | |||||
allowed 2 feet of (H) horizontal run, up to a maximum horizontal run of 8 feet.
Figure 27 - Rear Vent - ONE 90 DEGREE ELBOW
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 35 on page 18 ).
40 feet
| H |
| *Ceiling |
| Firestop/Spacer |
| (SV4.5VF) |
| **Wall |
| Firestop/Spacer |
V1 | (SV4.5HF) |
|
TABLE B
H Maximum | V Minimum | ||
feet | (meters) | feet | (meters) |
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 + V1 + H = 40 feet (12.2 m) Max.
H = 20 feet (6.096 meters) Max.
*Ceiling(12.2 meters)
Firestop/SpacerMaximum (SV4.5VF)
V
Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet mini- mum of (V) vertical vent will be required.
*When using Secure Flex, use Firestop/Spacer SF4.5VF
A Vent Restrictor, as shown in Figure 14 on Page 10, must be used in this application.
*When using Secure Flex, use Firestop/Spacer SF4.5VF
**When using Secure Flex, use Firestop/Spacer SF4.5HF
Figure 28 - Top Vent - TWO 90 DEGREE ELBOWS
This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) hori- zontal run, up to a maximum hori- zontal 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 35.
14
Figure 26 - Top Vent - STRAIGHT
WARNING: UNDER NO CIRCUMSTANCES MAY SEPARATE SECTIONS
OF CONCENTRIC FLEXIBLE VENT PIPE BE JOINED TOGETHER.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
