Monessen Hearth 36CDVXTRN installation instructions Vertical Through-the-Roof Applications

CDVX Series Direct Vent Gas Fireplace

Do not back fill around snorkel. A clearance of at least 4” (102 mm) 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 #8 x 1/2 sheet metal screws. It will be necessary to extend vent pipes out as far as protruding wall face. (Fig. 35)

	Snorkel
Foundation Recess	Wall Screws
Recess Brackets
Watertight Seal	Sheet Metal
Around Pipe
	Screws

BG401

Fig. 35 Snorkel installation, recessed foundation.

Vertical Through-the-Roof Applications

This Gas Fireplace has been approved for:

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

2.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” (457 mm).

Maximum

Example: Maximum horizontal length

0 x 45° elbows	=	10’ (3 m)
1 x 45° elbows	=	8¹⁄₂’ (2.6 m)
2 x 45° elbows	=	7’ (2.1 m)

3.A minimum of an 8’ vertical rise.

4.Two sets of 45° elbows offsets within these vertical installations. From 0 to a maximum of 8’ (2.4 m) of vent pipe can be used between elbows. (Fig. 37)

5.7DVCS must be used to support offsets. (Fig. 36) This application will require that you first determine the roof pitch and use the appropriate 7DVSKV (A, B or F). (Refer to Venting Components List, Page 27)

		Max.
		8’
		(2.4 m)
	45°		Typical
		50’	Ceiling
			Support
	Max.	(15 m)
			Application
	8’
	(2.4 m)
		45°
			Typical Roof
			Support Ap-
			plication
Typical Offset Installation			FP1021
Fig. 37	Typical vertical roof applications.

Minimum

10’ (3 m)

Vertical Through-the-Roof Installation

8’ (2.4 m) / Maximum

40’ (12 m) Vertical Rise

Pipe Straps Every 3’ (914 mm)

CFM148

Fig. 36 Support straps for horizontal runs.

1.	Locate your fireplace.
2.	Plumb to center of the (4”) flue collar from ceiling
	above and mark position.
3.	Cut opening equal to 9³⁄₈” x 9³⁄₈” (240 x 240
	mm). 10³⁄₈” x 9³⁄₈” (264 x 240 mm) when using
	7TCRVT1320.
4.	Proceed to plumb for additional openings through
	the roof. In all cases, the opening must provide a
	minimum of 1 inch clearance to the vent pipe, i.e.,
	the hole must be at least 9³⁄₈” x 9³⁄₈” (240 x 240 mm).
5.	Place fireplace into position.
6.	Place firestop(s) #7DVFS or Attic Insulation Shield
	#7DVAIS into position and secure. (Fig. 38)

20 20012253