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In the USA, the minimum vent height above the roof and/or adjacent walls is specified in ANSI Z223.1(latest edition); in Canada, by the current CAN-1 B149 installation code. It is also specified in major building codes. Always consult your local codes for specific requirements. A general guide to follow is the Gas Vent Rule (refer to Figure 4on page 4). Vertical (Straight) Installation Determine the number of straight vent sections required. 4 ..." (114 mm), 10 ..." (267 mm), 22 ..." (572 mm), 34 ..." (876 mm) and 46 ..." (1181 mm) net section lengths are available. Plan the vent lengths so that a section joint does not occur within the space defined by ceiling joists or roof rafters. Refer to the Vent Section Length Chart. SV4.5CGV-1 SV4.5FA OR Termination SV4.5FB Flashing *SV4.5VFFirestop/SpacerSV4.5L6/12/24/36/48Vent Sections 40' Max(12.2 M) 1" (25.4 mm) MinimumClearance toCombustibles*When using Secure Flex, use Firestop/SpacerAND SV4.5SC STORM COLLAR SF4.5VF Figure 21 VENT SECTION LENGTH CHART VENT SECTION LENGTH CHART Nominal T T Nominal Section 6 12 24 36 48 Section Length 6 12 24 36 48 O O Length (inches) (inches) T T Net Section A A 4-1/2 10-1/2 22-1/2 34-1/2 46-1/2 Net Section Length (inches) 4-1/2 10-1/2 22-1/2 34-1/2 46-1/2 L L Length (inches) Height of Vent inches ft Number of Vent Sections QT Y Height of Vent inches ft Number of Vent Sections QT Y 4.5 0.375 1 0 0 0 0 1 144 12 1 0 0 0 3 4 9 0.75 2 0 0 0 0 2 150 12.5 0 1 0 0 3 4 10.5 0.875 0 1 0 0 0 1 154.5 12.875 1 1 0 0 3 5 15 1.25 1 1 0 0 0 2 160.5 13.375 0 2 0 0 3 5 19.5 1.625 2 1 0 0 0 3 172.5 14.375 0 0 0 5 0 5 21 1.75 0 2 0 0 0 2 177 14.75 1 0 0 5 0 6 22.5 1.875 0 0 1 0 0 1 183 15.25 0 1 0 5 0 6 25.5 2.125 1 2 0 0 0 3 31.5 2.625 0 3 0 0 0 3 186 15.5 0 0 0 0 4 4 34.5 2.875 0 0 0 1 0 1 190.5 15.875 1 0 0 0 4 5 37.5 3.125 1 1 1 0 0 3 196.5 16.375 0 1 0 0 4 5 43.5 3.625 0 2 1 0 0 3 205.5 17.125 0 1 1 5 0 7 45 3.75 0 0 2 0 0 2 207 17.25 0 0 0 6 0 6 46.5 3.875 0 0 0 0 1 1 211.5 17.625 1 0 0 6 0 7 49.5 4.125 1 0 2 0 0 3 217.5 18.125 0 1 0 6 0 7 51 4.25 1 0 0 0 1 2 229.5 19.125 0 0 1 6 0 7 55.5 4.625 0 1 2 0 0 3 232.5 237 19.375 19.75 0 1 0 0 0 0 0 0 5 5 5 6 57 4.75 0 0 1 1 0 2 241.5 20.125 0 0 0 7 0 7 66 5.25 0 2 2 0 0 4 246 20.5 1 0 0 7 0 8 67.5 5.625 0 0 3 0 0 3 252 21 0 1 0 7 0 8 69 5.75 0 0 0 2 0 2 264 22 0 0 1 7 0 8 72 6 1 0 3 0 0 4 276 23 0 0 0 8 0 8 73.5 6.125 1 0 0 2 0 3 279 23.25 0 0 0 0 6 6 79.5 6.625 0 1 0 2 0 3 280.5 23.375 1 0 0 8 0 9 81 6.75 0 0 0 1 1 2 283.5 23.625 1 0 0 0 6 7 90 7.5 0 2 1 0 1 4 289.5 24.125 0 1 0 0 6 7 91.5 7.625 0 0 2 0 1 3 301.5 25.125 0 0 1 0 6 7 93 7.75 0 0 0 0 2 2 310.5 25.875 0 0 0 9 0 9 96 8 1 0 1 2 0 4 315 26.5 1 0 0 9 0 10 97.5 8.125 1 0 0 0 2 3 325.5 27.125 0 0 0 0 7 7 102 8.5 2 0 0 0 2 4 330 27.5 1 0 0 0 7 8 103.5 8.625 0 0 0 3 0 3 336 28 0 1 0 0 7 8 108 9 1 0 0 3 0 4 345 28.75 0 0 0 10 0 10 114 9.5 0 2 0 0 2 4 349.5 29.125 1 0 0 10 0 11 117 9.75 1 0 5 0 0 6 372 31 0 0 0 0 8 8 118.5 9.875 1 1 0 3 0 5 376.5 31.375 1 0 0 0 8 9 126 10.5 0 0 1 3 0 4 379.5 31.625 0 0 0 11 0 11 130.5 10.875 1 0 1 3 0 5 418.5 34.875 0 0 0 0 9 9 135 11.25 0 0 6 0 0 6 423 35.25 1 0 0 0 9 10 138 11.5 0 0 0 4 0 4 465 38.75 0 0 0 0 10 10 139.5 11.625 0 0 0 0 3 3 142.5 11.875 1 0 0 4 0 5 NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. Vertical (Offset) Installation Vertical (Offset) Installation Maintain a minimum 1" (25 mm) clearance to combustible materials for all vertical elements. Clearances for all horizontal elements are 3" (76 mm) on top, 1" (25 mm) on sides and 1" (25 mm) on the bottom. A. Frame ceiling opening -Use a plumb line from the ceiling above the appliance to locate center of the vertical run. Cut and/or frame an opening, 10..." x 10..." (267mm x 267mm) inside dimensions, about this center mark (Figure 22). 10...” Min. (267 mm) 10...” Min. (267 mm) Figure 22 B. Attach vent components to appliance -Secure Vent SV4.5 direct vent system components are unitized concentric pipe components featuring positive twist lock connections (seeFigure 23). All of the appliances covered in this document are fitted with collars having locking inclined channels. The dimpled end of the vent components fit over the appliance collar to create the positive twist lock connection. First Vent Component Align the dimple (four places) with the opening of the locking incline channel on appliance collar. Twist vent component clockwise to engage and seal. LockingIncline Channel Dimple Appliance collar Vent / Appliance CollarConnection Align the dimple (four places) of the upper vent section with the opening of the locking incline channel on the lower vent section. Twist vent component clockwise to engage and seal until arrow and dimple align. Locking Incline Channel Dimple Arrow Connected Vent Sections Vent / Vent SectionConnection Arrow Arrow Figure 23 Figure 24 To attach a vent component to the appliance collar, align the dimpled end over the collar, adjusting the radial alignment until the four locking dimples are aligned with the inlet of the ...

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