Round and Oval Type B GasVent Systems for use with natural as or liquid propane category I and draft hood equipped appliances and appliances listed to use Type B Gas Vent.
A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE THAT TYPE B GAS VENT BE INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. NOTE: Read through all of these instructions before beginning your installation. Failure to install as described in this instruction will void the manufacturer’s warranty, and may have an effect on your homeowner’s insurance and UL listing status.
CONTENTS Type B Gas Vent Type b gas vent Installation Instructions Round B Vent, General Information, Planning . . . . . . . . . . . . . . . . . . . . . . . . 4 Steps for Typical Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Bucket Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 11 Combination Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Round B Vent GENERAL INFORMATION Type B Gas Vents are for venting listed Natural Gas or Liquid Propane Category I appliances only. The appliances listed below typically (but not always) use Type B vent systems.
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Table 1 B-VENT WYE B-VENT USED AS CONNECTOR 45º / 60º ADJUSTABLE ELBOW FURNACE CONNECTOR RISE FAN ASSISTED FURNACE 1 INCH MINIMUM CLEARANCE (ALL SIDES) TOTAL VENT HEIGHT WATER HEATER CONNECTOR RISE DURA-CONNECT FLEXIBLE SINGLE WALL CONNECTOR WATER HEATER WITH DRAFT HOOD pipe size stock framed inside number dimensions (x & Y) of ceiling fig.
3. Ceiling Support. For a ceiling supported system, install the Square Firestop/Support as shown in Figures 6, 7, and 8. The Firestop Support must be framed in and the dimensions are shown in Table 1 and shown in Figure 4. Firestop Supports are currently manufactured for pipe sizes of 3” through 12” only.
STEP 2 STEP 1 STEP 3 Figure 9 WALL STRAPS EXISTING STRUCTURE 1 INCH MINIMUM CLEARANCE TO COMBUSTIBLES AT ALL POINTS 45º / 60º ELBOW WALL STRAP ELBOW GORES CEILING SUPPORT Figure 10 8 An optional Pipe Collar is available for decorative purposes. 6. Connectors. Only DuraVent connectors should be used between the appliances and the venting system.
prior to construction. Note that the enclosure requires an access door for inspection and maintenance purposes. 10. Terminations. Where the Pipe Sections pass through the roof, a hole must be cut to provide a minimum clearance (air space) of 1 inch between the Pipe and construction materials. Straight lengths of pipe are run up above the roof a minimum of 1-foot.
Table 2 Gas vent systems using vent caps listed by underwriters laboratories may terminate in accordance with this vent termination table ROOF PITCH Figure 13 CONTINUATION OF B-VENT B-VENT BUCKET SUPPORT RAFTER 16 OR 24 INCHES O.C. NAIL HERE B-VENT MUST EXTEND A MINIMUM OF 1" BELOW THE FINISHED CEILING CEILING SINGLE-WALL CONNECTOR (DURA-CONNECT) Figure 14 BUCKET SUPPORT 1. Description. The Bucket Support (Figure 13) is for properly supporting the B-vent between 16 or 24-inch O.C.
of the roof where the system is to penetrate, using a plumb bob or level. 3. Hole. Remove sufficient roofing material to cut a hole in the roof which will allow a minimum of 1 inch air space between the B-Vent and combustible roofing materials. 4. Flashing. Position the Flashing so the hole is directly over the end of the pipe, as shown in Figure 16. Run the top edge of the Flashing under the roof covering, nail as required, and seal with a non-hardening sealant, as shown in Figure 17. Seal all nail heads.
SHEET METAL SCREW 1/4 INCH LONG DRILL 1/8 INCH DIAMETER HOLE. DO NOT PENETRATE INNER LINER Figure 19 used to support each elbow (Figure 10). Do not allow the elbows to support the weight of the vent pipe. 3. 90° Elbows. Figure 20. The installer should apply pressure to the section at the points indicated by the arrows. This will prevent the adjacent sections of the elbow from turning, as the next pipe or fitting is twistlocked on.
system up towards the termination using DuraVent Type B Gas Vent, connect a Male Adaptor to the last section of the system, as shown in Figure 23, insuring that the inner liner of the Adaptor fits smoothly inside the Pipe or fitting below it. Push the Adaptor down as far as it will go, and tighten the locking bolt until the connection is snug. RELINING MASONRY CHIMNEYS FOR USE WITH GAS APPLIANCES 1. Description.
B C 15 INCHES A Figure 25 DRAFT HOOD CONNECTOR Figure 26 14 the appliance manufacturer for clarification. Place the appliance out in front of the fireplace area, as shown in Figure 27, and install the Draft Hood Connector, or other device in accordance with the appliance instructions. The Flex Pipe Coupling may be able to attach directly to the appliance. (d). Flex Pipe Assembly. Assemble first Rigid Pipe Section to the Flex Pipe, insuring that the “UP” arrows are in fact, pointing up.
non-hardening sealant to secure the flashing to the masonry (Figure 28). (h). Storm Collar. Slide the Storm Collar over the pipe down to top of the Flashing. Secure the Storm Collar in place with at least (3) 1/4” sheet metal screws (Figure 29). Do not penetrate the inner liner. The Storm Collar and Flashing will support the weight of the vent assembly. Use non-hardening sealant around the top of Storm Collar to make a weatherproof seal. (i). Termination Cap.
STORM COLLAR WITH SCREWS TEE OPTIONAL HIGH WIND CAP FLASHING TRIM COLLAR DRAFT HOOD CONNECTOR (IF REQUIRED) GAS APPLIANCE Figure 30 CERAMIC FIBER INSULATION Figure 31 16 (c). Tee. A Tee is installed at the bottom end of the assembled vertical Pipe Sections, as shown in Figure 30. The Tee has a removable Tee Cap at the bottom, for cleaning and condensate removal. If the configuration of the building permits it, a clean-out access gate is recommended. (d). Vertical Pipe Sections.
to obtain a specific location for the appliance. Make a mark on the horizontal Pipe Section flush with the vertical face of the masonry, for referencing the vertical position. Slip a Pipe Collar over the horizontal Pipe Section and install the remaining fittings as shown in Figure 30. A minimum of 12 inches of connector rise is required. (i). Insulation. Pull the Pipe Collar towards the 90° Elbow.
for example), the halogenated compounds get into the combustion air. When they are burned, they form compounds that cause corrosion. The corrective action in this case, is to isolate the appliance, and get the air supply from outside, or an uncontaminated area. (b) Condensate may be caused by incorrect sizing of the vent system. Follow the procedures in the various sizing publications to obtain the correct sizes for connectors and vents.
oval B Vent, type BW INSTALLATION NOTES M&G DuraVent Type B Gas Vent shall be used to vent only approved gas appliances with draft hoods and other Category I gas appliances listed for use with Type B Gas Vents: • Water Heaters • Space Heaters • Warm Air Furnaces • Duct Furnaces • Room Heaters • Unit Heaters • Hot Water Boilers • Steam Boilers • Floor Furnaces • Gas Fireplaces • Attic Furnaces Type B gas vents shall not be used for venting incinerators, conversion burners, combination gas/oil appliances, and
HIGH WIND CAP TABLE 1 DURACAP Roof Pitch STORM COLLAR FLASHING SEE TABLE 1 1 INCH MINIMUM CLEARANCE FIRESTOP SPACER PIPE ENCLOSURE WALL 1 INCH MINIMUM CLEARANCE GAS VENT SUPPORT ROUND PIPE 20 Minimum Height* FLAT TO 7/12 1.0 OVER 7/12 TO 8/12 1.5 OVER 8/12 TO 9/12 2.0 OVER 9/12 TO 10/12 2.5 OVER 10/12 TO 11/12 3.25 OVER 11/12 TO 12/12 4.0 OVER 12/12 TO 14/12 5.0 OVER 14/12 TO 16/12 6.0 OVER 16/12 TO 18/12 7.0 OVER 18/12 TO 20/12 7.5 OVER 20/12 TO 21/12 8.
A gas vent support or firestop spacer must be provided where the vent passes through the ceiling. The ceiling opening is framed, using the same sized lumber as the existing joists, to fit around the raised edge of the gas vent support, which is pushed up into the ceiling from below. The hanger straps are nailed to the framing using 1 1/2-inch box nails to hold the gas vent support firmly, and the clamp is then tightened around the vent pipe.
4-INCH OVAL GAS VENT FOR INSTALLATION IN 2” X 4” STUD WALLS MH6375 CATEGORY I APPLIANCES ONLY 1 INCH MINIMUM CLEARANCE TO COMBUSTIBLES Gas vent shall extend at least 2 feet above the highest point where it passes through the roof, and at least 2 feet higher than any portion of the building within 8 feet. Install oval flashing, storm collar, and oval vent cap. Where pipe passes through the roof, maintain 1-inch minimum clearance to all combustibles. Attach base plate to wall furnace.
DuraVent CAP DuraVent CAP STORM COLLAR STORM COLLAR ROOF FLASHING ROOF FLASHING OVAL-TO-ROUND ADAPTER NOTE: OFFSET MUST BE SUPPORTED CEILING PLATE BW VENT PIPE OVAL-TO-ROUND ADAPTER CEILING PLATE BW VENT PIPE OVAL TEE BASE PLATE TEE SUPPORT 2” X 4” STUDS 16” OC 2” X 4” STUDS 16” OC 2” X 4” SUPPORT Type BW 2” x 4” Oval Installation 1 2 Type BW 2” x 4” Installation 3 To assemble, align the two pieces, and push them together until they click.
5-INCH OVAL GAS VENT FOR INSTALLATION IN 2” X 4” STUD WALLS MH6375 CATEGORY I APPLIANCES ONLY Where pipe passes through the roof, maintain 1-inch minimum clearance to all combustible materials. Install oval flashing, storm collar, and oval vent cap. Gas vent shall extend at least 2 feet above the highest point where it passes through the roof, and at least 2-feet higher than any portion of the building within 8 feet. Attach base plate to 2” x 4” support.
HIGH WIND CAP DuraVent CAP MALE END STORM COLLAR ROOF FLASHING SEE TABLE 1 FEMALE END SUPPORT 1 INCH MINIMUM CLEARANCE TO COMBUSTIBLES OVAL-TO-ROUND ADAPTER To assemble, align the two pieces, and push together until they click. FIRESTOP SPACER Use only vents labeled “For Exterior Use Only”, above roofline. (Canada Only) OVAL PIPE OVAL TEE BASE PLATE AND TEE SUPPORT 2” X 4” SUPPORT Diagram showing transition from 5” oval to round vent pipe, and optional offset.
6-INCH OVAL GAS VENT FOR INSTALLATION IN 2” x 6” STUD WALLS MH6375 CATEGORY I APPLIANCES ONLY Ensure at least 1 inch clearance to all combustibles, including the area the pipe passes through the roof. Install oval flashing, storm collar, and oval vent cap. Gas vent shall extend at least 2 feet above the roof, and at least 2 feet higher than any portion of the building within 2 feet. Attach base plate to 2” x 6” support. Firestop spacers shall be installed as shown on all floors. 1.
HIGH WIND CAP DuraVent CAP MALE END STORM COLLAR ROOF FLASHING SEE TABLE 1 FEMALE END SUPPORT 1 INCH MINIMUM CLEARANCE TO COMBUSTIBLES OVAL-TO-ROUND ADAPTER To assemble, align the two pieces, and push together until they click. FIRESTOP SPACER Use only vents labeled “For Exterior Use Only”, above roofline. (Canada Only) OVAL PIPE OVAL TEE BASE PLATE AND TEE SUPPORT 2” X 6” SUPPORT Diagram showing transition from 6” oval to round vent pipe, and optional offset.
M&G DuraVent limited lifetime Warranty M&G DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer.
