Vermont Casting DVHVAC36 manual Below Grade Installation

DVHVAC36

STEP 4

Measure the horizontal length requirement including a 2" (51 mm) overlap, i.e. from the elbow to the outside wall finish plus 2", or the distance required if installing a second 90° elbow. (Fig. 25)

Always install	X
horizontal vent-
ing on a level
plane.

CFM136

Fig. 25 Measure horizontal length including 2" overlap.

STEP 5

Use appropriate length of pipe section - telescopic or fixed - and install the horizontal vent sections. The 20" (508 mm) section of pipe which goes through the wall is packaged with the 7TDVSK starter kit, and can be cut to suit if necessary. (Fig. 26)

Sealing vent pipe and firestop gaps with high temperature sealant will restrict cold air being drawn in around the fireplace.

STEP 6

Apply high temperature sealant to 4" (102 mm) and 7" (178 mm) collars or the termination 1" (25 mm) away from the end. Guide the vent termination's 4" and 7" col- lars into their respective vent pipes. Double check that the vent pipes overlap the collars by 2" (51 mm). Secure the termination to the wall with screws provided and caulk around the wall plate to weatherproof. (Fig. 27)

X X

CFM138

Fig. 27 Horizontal length requirement.

STEP 7

Support the horizontal pipes every 36" (914 mm) with metal pipe straps. Make sure the horizontal vent pipe is installed on a level horizontal plane.

STEP 8

Re-check the fireplace to make sure that it is levelled, properly positioned and nailed or screwed to the floor. If applied, the fireplace's adjustable frame drywall strips (nailing flanges) should be fastened. Refer to "Framing

High Temperature Sealant

X

CFM137

& Finishing" section.

Below Grade Installation

When it is not possible to meet the required vent ter- minal clearances of 12" (305 mm) above grade level, a snorkel termination, #7TDVSNORK is required. It allows installation depth of down to 7" (178 mm) below grade level. The 7" is measured from the center of the hori- zontal vent pipe as it penetrates through the wall.

Ensure sidewall venting clearances are observed.

If venting system is installed below ground, a window well with adequate and proper drainage to be installed around the termi- nation area is recommended.

The maximum horizontal run with 24" (610 mm) vertical rise is 36" (914 mm) from the back of the fireplace to the face of the exterior wall. Refer to the

Fig. 26 Apply high temperature sealant.

vent graph on Page 12 for extended horizontal run if the vertical rise exceeds 24" (610 mm).

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