Below Grade Installation - Majestic Designer Installation And Operating Instructions Manual

Direct vent gas fireplace

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Table of Contents

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" (178 mm) below

grade level. The 7" (178 mm) 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. Page 21, Figure 20

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. Figure 31

3. Install vent system.

4. Ensure a watertight seal is made around the vent pipe coming through the wall.

5. Slide the snorkel into the vent pipes and secure to the wall.

6. Level the soil so as to maintain a 4" clearance below snorkel. Figure 31

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 #8 x 1/2

sheet metal screws. It will be necessary to extend vent pipes out as far as the protruding

wall face. Figure 32

Firestop

24"

Minimum

Figure 31 -