Vermont Casting BHDT36 Below Grade Installations, Vertical Through Roof Applications

BELOW GRADE INSTALLATIONS

When it is not possible to meet the required vent terminal clearances of 12 inches (305mm) above grade level a model #7DVSKS vent kit is required. It allows installation depth of down to 7 inches (178mm) below grade level. The 7 inches is measured from the centre of the horizontal vent pipe as it penetrates through the wall.

If venting system is installed below ground, we recommend a window well with adequate and proper drainage.

FOUNDATION

RECESS

WATERTIGHT

SEAL

AROUND

PIPE

SNORKEL

WALL

SCREWS

SHEET METAL	Fig. 26
SCREWS

Ensure sidewall venting clearances are observed.

The maximum horizontal run with 24" (610mm) vertical rise is 36" (914mm) from the back of the fireplace to the face of the exterior wall. See vent graph (Fig. 17) for extended horizontal run if the vertical exceeds 24" (610mm).

1.Establish vent hole through the wall. See page 12

2.Remove soil to a depth of approximately 16" (406mm) below base of snorkel. Install window well (not supplied). Refill hole with 12" (305mm) of coarse gravel leaving a clearance of approximately 4" (100mm)below snorkel. (Fig. 25)

3.Install vent system. See page 12/13, Steps 2 through 5.

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 inch 7DVSKS's snorkel collars.

6.Slide into vent pipe and secure to the wall.

7.Level the soil so as to maintain a 4" (100mm)clearance below snorkel (Fig. 25).

If the foundation is recessed, use recess brackets (not supplied) for securing lower portion of the snorkel. Fasten brackets to wall first and 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 protruding wall face (Fig. 26).

VERTICAL THROUGH THE

ROOF APPLICATIONS

MAXIMUM

10 FT

(3048mm)

MINIMUM

8FT./

MAXIMUM 40 FT.

VERTICAL

RISE

PIPE STRAPS

EVERY 3’ (914mm)

Fig. 27

ZERO CLEARANCE

SLEEVE IF REQUIRED

FIRESTOP

7" PIPE

24"/608mm

MINIMUM*

	7DVSKS (SNORKEL)
SCREWS	MINIMUM
	4" CLEARANCE
	GROUND
	WINDOW WELL
	GRAVEL
	DRAIN

FOUNDATION WALL

*A minimum of 24"/608mm vertical pipe must be installed when using the 7DVSKS/7TDVSKS kit.

*The 22" vertical rise (center to center) of the snorkel may be included for calculation of max. horizontal run.

Fig. 25

This Gas Fireplace has been approved for,

a)Vertical installations up to 40 feet (12 metres) in height. Up to a 10 ft.(3048mm) horizontal vent run can be

installed within the vent system using a maximum of three 90° elbows.

b)Up to two 45° elbows may be used within the horizontal run. For each 45° elbow used on the horizontal level the maximum horizontal length must be reduced by 18 inches (457mm).

Example: Maximum horizontal length

0	-	45° elbows	10 ft. (3048mm)
1	-	45° elbows	8.5 ft. (2590mm)
2	-	45° elbows	7 ft. (2133mm)

c) A minimum of an 8 ft. vertical rise.

d) Two sets of 45 degree elbow offsets within these

vertical installations. From 0 to a maximum of 8 ft.

(2438mm) a vent pipe can be used between elbows.

(Fig. 28)

DO NOT BACK FILL AROUND SNORKEL. SOIL SHOULD NOT BE LESS THAN 4" (100mm) BELOW SNORKEL.

- 14 -

e) 7DVCS must be used to support offsets. (Fig. 29)

This application will require that you first determine the roof

pitch and use the appropriate 7DVSKV (A,B or F). (see

Venting Components, page 16)