Majestic Appliances RDV4136 Twist Lock Pipes, How to Use the Vent Graph, Example A, Example B

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 sliding joints 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 ends 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. 12	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. 13) locate the point intersecting with the 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’ (3.4 m) the horizontal run to the face of the outer wall must not exceed 14’ (4.3 m).

Example B:

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

NOTE: The RDV4136 fireplace is shipped with a deflec- tor behind the rear log support. If the fireplace is set up with an extended vent configuration, it may be neces- sary to loosen the two (2) screws securing the rear log

RDV4136 Series Direct Vent Gas Fireplace

30
29
28																		thecenterofthe	Verticaldimensionfrom
18
27
26
25
24
23
22
21
20
19																		horizontalvent	thefloorofthe
11
17
16
15
14
13
													eg:	A
12																		pipe	fireplace
7
10
9
8
6								eg:		B									to
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. 13 Sidewall venting graph. (Dimensions in feet)

support to the back of the fireplace and drop the deflec- tor down over the air inlet ports. There are five (5) holes on each side of the deflector. For extended vent runs, hole ‘C’ works the best. (Fig. 14) This is a guide. It may be necessary to adjust the deflector in a different hole location depending on your installation. Be sure there is no lifting or ghosting of the flame.

E

D

C

B

A

FP1833

Fig. 14 Deflector holes.

In conjunction with the deflector over the air inlet, there is a flue baffle. The baffle is shipped under the fireplace. Remove the two (2) screws from the flue deflector and secure the baffle to the deflector. (Fig. 15)

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