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Actual length s gained after fitting overlaps must be taken into consideration (lineal gain) and are given in the lineal gain chart (see Figure 6). Linea l Gain is the actual measurable length of a part after two or more parts are connect ed. For Canada, u se chimney parts designated "HT". WARNING: The opening in the collar around the chimney at the top of the fireplace must not be obstructed. Never use blown insulation to fill the chimney enclosure. VENTING INSTALLATION Continued USING ELBOW OFFSETS (30E-12DM) 1. To achieve desired offset, you may install combinations of 12, 18, 24, 36 and 48" length of double wall pipe (see offset chart and Figure 7). 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 OFFSET CHART (22-50 FT. SYSTEM HEIGHT) Return Elbow 2. Chimney weight above offset rests on return elbow. Straps must be securely nailed to rafters or joists (see Figure 8, details a & b). 3. Maximum length of pipe between supports (return elbow or 12S-12DM) is 6' of angle run. Maximum of two 6' angle run sections per chimney system (see Figure 7). 4. All pipe connections between the offset and return must be secured with two screws on the outer pipe only (see Figure 9, page 10). Do not penetrate the inner stainless. 2" Min. Straps Straps StrapsStraps Detail A Return Elbow Detail B Angle Firestop See Detail A See Detail B Figure 8 - Ceiling Support Pipe 12S-12DM Figure 7 - Typical Offset Terminations Return Elbow Offset Elbow Offset Elbow 6' Max. 6' Max. 6' Max. 6' Max. 6' Max. 6' Max. Return Elbow Offset Elbow Offset Elbow Return Elbow A B C Offset Elbow Ceiling Support Pipe 12S-12DM Return Elbow 117541-01A 10 117541-01A VENTING INSTALLATION Continued Figure 9 - Elbow Offset B A Screws FIRESTOP SPACERS (FS-10, 1100EFS-10DM FOR JM36) 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 10. They also provide complete separation from one floor space to another or attic space as required by most codes. When the double wall pipe passes through a framed opening into an attic space, the firestop must be placed into an attic floor as shown in Figure 11. Figure 10 - Firestop Spacer with Living Space Above Ceiling Figure 11 - Firestop Spacer with Attic Space Above Ceiling Existing Ceiling Frame Firestop Spacer Screws or Staples (Min. of 8) Firestop Spacer Screws or Staples (Min. of 8) PENETRATING THE ROOF To maintain a 1" (JM36) or 2" (JM42/JM50) clearance to the pipe on a roof with a pitch, a rectangular opening must be cut. 1. Determine the center point through which the pipe will penetrate the roof. 2. Determine the center point of the roof. Pitch is the di sta nce the roof drops over a given span, usually 12". A 6/12 pitch m eans that the roof drops 6" for each 12" one measure horizontally down from the roof rafters. 3. Use the roof opening chart (F igure 12) to determi ne the correct openin g length and flashing required. 17" Min. (432mm) 30" Min. (762mm) 1" Min. (25mm) 1" Min. (25mm) 1" Min. (25mm) Opening "A" Roof Opening JM36 Pitch Slope Opening "A" Max. Used Flashing Model No. Flat 0° 17" V6F-10DM 0- 6/12 26.6° 19" V6F-10DM 6/12- 12/12 45.0° 24" V12F-10DM Roof Opening JM42/50 Pitch Slope Opening "A" Max. Used Flashing Model No. Flat 0° 19.5" V6F-10DM 0- 6/12 26.6° 22' V6F-10DM 6/12- 12/12 45.0° 27" V12F-10DM Existing Ceiling Frame 19.5" Min. (495mm) 30" Min. (762mm) 2" Min. (51mm) 2" Min. (51mm) 2" Min. (51mm) Opening "A" Figure 12 - Roof Opening Measurements VENTING INSTALLATION Continued 4. Remove the shingles around the opening measured. Cut out this section. 5. Add the next sections of the pipe until the end penetrates the roof line. Check to see that the proper clearances are maintained. Extend chimney by adding sections of double wall pipe until pipe is minimum of 30" above the highest point of the roof cutout. Termination and chimney must extend a minimum of 36" above the highest point where it passes through the roof. FLASHING INSTALLATION (V6F-10DM OR V12F-10DM) Determine the flashing to be used with the roof opening chart. Slide flashing over pipe until base is flat against roof. Replace as many shingles as needed to cover exposed area and flashing base. Secure in position by nailing through shingles (see Figur...

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