Vermont Casting BHDT36 General Information on Assembling Twist Lock Vent Pipes

GENERAL INFORMATION ON ASSEMBLING

THE TWIST LOCK VENT PIPES

When using CFM Majestic twist lock pipe it is not neces- sary to use silicone to seal the twist lock joints. The only areas that need silicone are the collars on the fireplace, the telescoping pipe (if used) and the horizontal termina- tion connection (when necessary).

To join the pipes together, simply align the beads of the male end with the grooves of the female end and while joining the two together, twist the pipe until the flange on the female end touches the external bead on the male end. Secure the joints with three sheet metal screws.

To make easier to assembly, we suggest putting lubri- cant (vaseline or similar) on the male end of the twist lock pipe.

TWIST LOCK PIPE JOINT

Screw Holes

Fig. 34

Crimped pipe and new twist lock pipe.

It is possible to use CFM Majestic 4" & 7" direct vent crimped pipe and elbows in your system, with the new CFM Majestic 4" & 7" Direct Vent Twist Lock Pipe.

You must use the crimped pipe first in the system off the appliance.

1.Install expanded end of crimped pipe or elbow onto the 4" & 7" collars off the fireplace with high tem- perature sealant and 3 screws.

2.If you wish to continue your system with your 4" & 7" crimped pipe or elbow apply high temperature sealant on crimped end of pipe at 2" in from end and fasten the next pipe with 3 sheet metal screws.

3.When you wish to continue your system with the New Twist Lock pipe or elbow, apply high tempera- ture sealant on crimped end of pipe at 1-1/2" from end, and slip the female end of the twist lock pipe over the crimped end of the pipe and secure with 3 sheet metal screws. Continue the installation with twist lock pipe placing the female end over the male end and fastening with 3 sheet metal screws.

You do not have to use high temperature sealant when using twist lock pipe between the female and male ends of the twist lock.

Except on: 1.Adjustable lengths (telescoping joint only) 2.Crimped collar on existing fireplaces. 3.Terminations where required.

VERTICAL SIDEWALL APPLICATIONS

Vent Starter Kit 7TDVSK must be used in Vertical Sidewall installations.

Since it is very important that the venting system maintain its balance between the combustion air intake and the flue gas exhaust, certain limitations as to vent configurations apply and must be strictly adhered to.

The graph showing the relationship between vertical and horizontal side wall venting will help to determine the various vent lengths allowable. Fig. 39.

Minimum clearance between vent pipes and combustible materials is one (1") inch (25

mm)on top, bottom and sides unless otherwise noted.

When vent termination exits through foundation less than 20" below siding outcrop, the vent pipe must flush up with the siding. A 7DVSS must also be used.

It is always best to locate the fireplace in such a way that minimizes the number of offsets and horizontal vent length.

The horizontal vent run refers to the total length of vent pipe from the flue collar of the fireplace to the face of the outer wall.

Horizontal plane means no vertical rise exists on this portion of the vent assembly.

For some installations, it may be desireable to have some amount of the horizontal vent run immediately after the fireplace. A verti- cal rise must be used but can be located anywhere in the vent system, to meet the perimeters identified in the venting graph.

		20 ft. (6100mm)
		PIPE STRAPS
		EVERY 3 ft.(914mm)
(2286mm)		FIRESTOP/ZERO
	PIPE STRAPS	CLEARANCE SLEEVE
90"
	EVERY 3 ft.
	(914mm)
		Fig. 35

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