Vermont Casting H33BDVRRNP manual Twist Lock Pipes, How to Use the Vent Graph

Pyromaster© H33BDVRRN/P

Twist Lock Pipes

When using CFM Corporation twist-lock pipe it is not necessary to use sealant on the joints. The only areas of the venting system that need to be sealed with high temperature silicone sealant are the collars on the fireplace and termination, and the sliding joint of any telescopic vent section used in the system.

To join the twist lock pipes together, simply align the beads of the male end with the grooves of the female end, then while bringing the pipe together, twist the pipe until the flange on the female end contacts the external flange on the male end. It is recommended that you secure the joints with three (3) sheet metal screws, however this is not mandatory with twist lock pipe.

To make it easier to assemble the joints we suggest putting a lubricant (Vaseline or similar) on the male end of the twist lock pipe prior to assembly.

	Male End	Female End
	Screw Holes	TWL100
Fig. 10	Twist-lock pipe joints.

How to Use the Vent Graph

The vent chart should be read in conjunction with the following vent installation instructions to determine the relationship of the vertical and horizontal dimensions of the vent system.

1.Determine the height of the center of the horizontal vent pipe exiting through the outer wall. Using this dimension on the Sidewall Vent Graph. (Fig. 11) locate the point intersecting with slanted graph line.

2.From the point of this intersection, draw a vertical line to the bottom of the graph.

3.Select the indicated dimension, and position the fireplace in accordance with same.

Example A:

If the vertical dimension from the floor of the fireplace is 11’ (3.4m) the horizontal run to the face of the outer wall must not exceed 14’ (4.3m).

Example B:

If the vertical dimension from the floor of the unit is 7’ (2.14m), the horizontal run to the face of the outer wall must not exceed 8¹⁄₂’ (2.6m).

		30
		29
		28
		27
		26
to		25
		24
UnittheofFloorthefromDimension	PipeVentHorizontaltheofCenter
		23
		22
		21
		20
		19
		18
		17
		16
		15
		14
		13
		12											eg: A
		11
		10
Vertical	the	9							eg: B
		8
		7
		6
		5
		4
		3
		3	4	5	6	7	8	9	10 11	12	13	14	15	16	17	18 19	20

Horizontal Dimension From The Outside Face Of The Wall To The Center Of The Fireplace Vent Flange

Sidewall vent graph showing the relationship between vertical

and horizontal dimensions for a Direct Vent flue system.

Fig. 11 Sidewall venting graph. (Dimensions in feet)

Rear Wall Vent Applications

NOTE: It is not necessary to seal the vent pipe joints for any straight out of the wall rear vent applications.

NOTE: Vent Starter Kit Model 7TDVSK or 7DVSK must be used in straight out of the wall rear vent applications.

Maximum Vent Length......20” (508 mm) (Fig. 12)

Minimum clearance between vent pipes and combustible materials is one (1”) inch (25 mm) on the sides and two (2”) inches (50 mm) on top.

When vent termination exits through foundation less than 20” (508 mm) below siding outcrop, the vent pipe must flush up with the siding.

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