Desa C36EMW Offset Chart, Ceiling Support Pipe, Elbow Offset, Firestop Spacers V3600FS-8DM

If the adapter is needed, secure it onto the firestop using holes provided (see figure 10). The row of holes on the sides of the thimble is provided to allow for pitch variances. Position the firestop assembly and thimble to desired angle and secure with screws provided. Insert the thimble and firestop into the prepared opening and secure to the ceiling by nailing through the firestop flanges. The thimble should be even with or above the roofline. Thimble extensions are available (as an option) when required. See “accessories” on page 12.

NOTE: If there is a second story in the home, firestop spacer V3600FS-8DM will be required. See “Firestop Spacer”.

INSTRUCTIONS WHEN ELBOW OFFSET (30E-8DM)

OF CHIMNEY IS NEEDED TO INSTALL ELBOWS

1.To achieve desired offset, you may install combinations of 12”, 18”, 24”, 36” and 48” length of double wall pipe (SEE

SINGLE OFFSET CHARTAND FIGURE 12).

OFFSET CHART

OFFSET	RISE			CHIMNEY LENGTH
A	B	48"	36"		24"	18"	12"
4 - 3/8	16 -3/8		ELBOW SET ONLY
9 - 3/4	25 - 1/2						1
12 - 3/4	30 - 3/4					1
15	34 - 3/4				1
18	40					1	1
21 - 1/4	46 - 1/4		1
23 - 3/4	49 - 1/4				1	1
27 - 3/4	56 - 3/4	1
30	60 - 3/4		1			1
33	66	1					1
36	71	1				1
38 - 1/4	75		2
41 - 1/4	80 - 1/4		1			1	1
45	86 - 3/4		2
46 - 3/4	89 - 1/2	1				1	1
51	97	1	1
53 - 1/4	101		2			1
56 - 1/4	106 - 1/4	2
59 - 1/4	111 - 1/2	1	1			1
61 - 3/4	115 - 1/2	2					1
64 - 3/4	120 - 3/4	2				1
68 - 1/4	127	1	2
70	130	2				1	1
74 - 1/4	137 - 1/2	1	2				1
76 - 3/4	141 - 1/2	1	2			1
79 - 3/4	146 - 3/4		4

2.Chimney weight above offset rests on return elbow. Straps must be securely nailed to rafters or joists (see figure 12, details a & b).

3.Maximum length of pipe between supports (return elbow or 12S-8DM) is 2’ of angle run.

Figure 11 CEILING SUPPORT PIPE - 6 -

All joints (where two pipes are joined) should be secured with two screws, only on the outer pipe, and shall not penetrate the inner stainless.

Figure 12 ELBOW OFFSET

FIRESTOP SPACERS (V3600FS-8DM)

Firestop spacers are required at each point where the chimney penetrates a floor space. Their purpose is to establish and maintain the required clearance between the chimney and the combustible materials. When the pipe passes through a framed opening into a living space above, the firestop must be placed onto the ceiling from below as shown in figure 13.

Figure 13 FIRESTOP SPACER

PENETRATING THE ROOF

To maintain a 1-inch clearance to the pipe on a roof with a pitch, a rectangular opening must be cut.

STEP 1: Determine the center point through which the pipe will penetrate the roof.

STEP 2: Determine the center point of the roof. Pitch is the distance the roof drops over a given span, usually 12 inches. A 6/12 pitch means that the roof drops 6 inches for each 12 inches one measure horizontally down from the roof rafters.

STEP 3: Use the roof opening chart (figure 14) to determine the correct opening length and flashing required.

STEP 4: Remove the shingles around the opening measured and cut out this section.

STEP 5: Add the next sections of the pipe until the end penetrates the roofline. Check to see that the proper clearances are maintained. Extend chimney by adding sections of double wall pipe until pipe is a minimum of 30 inches above the highest point of the roof cutout. Termination and chimney must extend a minimum of 36 inches above the highest point where it passes through roof.

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