VENT INSTALLATION
BELOW GRADE INSTALLATIONS
When it is not possible to meet the required vent terminal clearances of 12" above grade level, a snorkel kit is recommended. It allows installation depth down to 7" (178mm) below grade level. The 7" (178mm) is measured from the center of the horizontal vent pipe as it penetrates through the wall.
Ensure that sidewall venting clearances are observed. If venting system is installed below ground, we recommend a window well with adequate and proper drainage to be installed around the termination area.
If installing a snorkel, a minimum 24" vertical rise is necessary. The maximum horizontal run with the 24” vertical pipe is 36". This measurement is taken from the collar of the fireplace (or transition elbow) to the face of the exterior wall. See the Sidewall Venting Graph for extended horizontal run if the vertical exceeds 24".
1.Establish vent hole through the wall.
2.Remove soil to a depth of approximately 16" below base of snorkel. Install drain pipe. Install window well (not supplied). Refill hole with 12" of coarse gravel leaving a clearance of approximately 4" below snorkel. See Figure 16.
3.Install vent system.
4.Ensure a watertight seal is made around the vent pipe coming through the wall.
5.Apply high temperature sealant caulking (supplied) around the 5" and 8" snorkel collars.
6.Slide the snorkel into the vent pipes and secure to the wall.
7.Level the soil so as to maintain a 4" clearance below snorkel. See Figure 16.
WARNING
•Do not back fill around snorkel.
•A clearance of at least 4" must be maintained between the snorkel and the soil.
If the foundation is recessed, use recess brackets (not supplied) for securing lower portion of the snorkel. Fasten brackets to wall first, then secure to snorkel with self drilling #8x1/2 sheet metal screws. It will be necessary to extend vent pipes out as far as the protruding wall face. See Figure 17.
| Screws |
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Firestop | Minimum |
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| 4" Clearance |
| Snorkel | |
| Ground |
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| Window Well | Foundation |
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24" | Recess | Wall Screws | ||
Gravel | ||||
Minimum |
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Drain |
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| Watertight Seal |
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| Foundation Wall | Around Pipe | Sheet Metal | |
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| Screws | ||
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Figure 16 - Below Grade Installation | Figure 17 - Snorkel Installation, | |||
Recessed Foundation | ||||
73D0024 | 19 |
