Vermont Casting DVRT41 manual Below Grade Installation, Vertical Through-the-Roof Application

Below Grade Installation

When it is not possible to meet the required vent terminal clearances of 12” (305mm) 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 the sidewall venting clearances are ob- served. If venting system is installed below ground, we recommend a window well with adequate and

DVRT41Direct Vent Gas Fireplace

Do not back fill around snorkel.

A clearance of at least 4” must be main- tained 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 #8 x 1/2 sheet metal screws. It will be necessary to extend vent pipes out as far as the protruding wall face. (Fig. 38)

proper drainage to be installed around the termina- tion area.

If installing a snorkel, a minimum 24” (610mm) vertical rise is necessary. The maximum horizontal run with the 24” vertical pipe is 36” (914mm). 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 verti- cal exceeds 24” (610mm).

1.	Establish vent hole through the wall (Fig. 31)
2.	Remove soil to a depth of approximately 16”
	(406mm) below base of snorkel. Install drain pipe.

Foundation

Recess

Watertight

Seal Around

Pipe

Snorkel

Wall

Screws

Sheet Metal

Screws

BG401

	Install window well (not supplied). Refill hole with
	12” (305mm) of coarse gravel leaving a clearance of
	approximately 4” (102mm) below snorkel. (Fig. 37)
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 4” and 7” 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” (102mm)
	clearance below snorkel. (Fig. 37)

Zero Clearance Sleeve	Screws
(if required)
	7TDVSNORK
Firestop	(Snorkel)
7" Pipe	4" Clearance Min.
24" (608mm)	Window Well
Minimum*
	Gravel
	Drain
	Foundation Wall
	*A minimum of 24"
	(608mm) vertical pipe
	must be installed when
	using the 7TDVSNORK.
	BG402a

Fig. 37 Below grade installation.

Fig. 38 Snorkel installation, recessed foundation.

Vertical Through-the-Roof Application

This gas fireplace has been approved for:

•Vertical installations up to 40’ (12m) in height. Up to a 10’ (3m) horizontal vent run can be installed within the vent system using a maximum of two 90° elbows. (Fig. 39)

•Up to two 45° elbows may be used within the horizontal run. For each 45° elbow used on the horizontal plane, the maximum horizontal length must be reduced by 18” (450mm).

Example: Maximum horizontal length:

No elbows	=	10’ (3m)
1 x 45° elbow	=	8.5’ (2.6m)
2 x 45° elbows	=	7’ (2.1m)

•A minimum of an 8’ (2.5m) vertical rise is required.

•Two sets of 45° elbow offsets may be used within the vertical sections. From 0 to a maximum of 8’ (2.5m) of vent pipe can be used between elbows. (Fig. 40)

•7DVCS supports offsets. (Fig. 42) This application will require that you first determine the roof pitch and use the appropriate starter kit. (Refer to Venting Components List)

•The maximum angular variation allowed in the system is 270°. (Fig. 40)

•The minimum height of the vent above the highest point of penetration through the roof is 2’ (610mm). (Fig. 43) Refer to note 2, Page 13.

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