Burnham 20_PV_I manual Install Vent Pipe, General, Horizontal Through Wall Vent Installation

D.Install Vent Pipe, General.

1.Start at vent connector. Work toward vent terminal.

2.Use ¾ inch pipe strap to support horizontal runs, maintain vent location and slope, and prevent sags. Do not restrict thermal expansion movement. Maximum support spacing is 5 feet.

3.Provide minimum 5 inch clearance to combustible materials. Use thimble when penetrating combustible wall.

a.203PV and 204PV - Single wall thimble, Burnham Part No. 8116116. Other wall thimble manufacturers are American Metal Products, Hart & Cooley, and Metal Fab.

b.205PV and 206PV - Double wall thimble, Burnham Part No. 8116115 (accomodates 5" to 8¾" wall thickness). Another wall thimble manufacturer is Hart & Cooley.

4.Cut pipe to length using hacksaw with minimum 32 teeth per inch or circular saw with metal abrasive wheel. Remove bead end only - bell end accepts next fitting or pipe. Cut must be square with pipe. Scrape off burrs with sharp edged tool.

Note: If remaining pipe (less bell) must be used, beaded end of mating pipe/fitting must be crimped.

5.Seal all joints using Dow Corning Silastic 732 RTV, Dow Corning Silastic 736 RTV, Polybac #500 RTV, or Sil-bond RTV 4500 (Acetoxy). Do not use other adhesives or sealants.

6.Procedure for joining pipe and fittings. See Figure 8.

a.Clean pipe or fitting. Remove all dirt and grease.

b.Slip locking band over pipe/fitting bell.

c.Apply continuous ¼ inch bead of sealant around bead end of pipe/fitting no more than 1/8 inch from end.

d.Insert pipe/fitting into bell. Smooth sealant for continuous seal around gap between bead and bell. Apply additional sealant if necessary.

e.Slip locking band over joint and tighten. Do not secure joint with sheet metal screws or pop rivets.

E.Horizontal (Through Wall) Vent Installation.

1.Maintain minimum ¼ inch per foot slope in horizontal runs. Slope pipe down toward vent terminal.

CAUTION

Moisture and ice may form on surfaces around vent terminal. To prevent deterioration, surfaces should be in good repair (sealed, painted etc.)

2.Vent terminal location restricted per following:

a.Minimum 12 inches above grade plus normally expected snow accumulation level, or 7 feet above grade if located adjacent to public walkway. Do not install over public walkway where local experience indicates condensate or vapor from Category III appliances creates a nuisance or hazard.

Figure 8: Typical Joint Detail

b.Minimum 3 feet above any forced air inlet located within 10 feet.

c.Minimum 4 foot below, 4 foot horizontally from, or 1 foot above any door, window, or gravity air inlet.

d.Minimum 4 feet horizontally from, and in no case above or below, unless a 4-foot horizontal distance is maintained, from electric meters, gas meters, regulators and relief equipment.

e.Minimum 12 inches from overhang or corner.

3.Use wall thimble when passing through combustible outside wall (thimble use optional for noncombustible wall). Insert thimble through wall from outside. Secure outside flange to wall with nails or screws, and seal with adhesive material. Install inside flange to inside wall, secure with nails or screws, and seal with adhesive material.

4.For noncombustible wall when thimble is not used, size opening such that bell with locking band attached cannot pass through.

5.Join vent terminal to vent pipe. Cut vent pipe to locate vent terminal 3 inches (minimum) and 6 inches (recommended) from wall when joined to inside vent piping. See Figure 9. Vent terminal clearance to vinyl wall surfaces is 6 inches.

6.Insert vent pipe through thimble/opening from outside and join to vent system. Apply sealant between vent pipe and opening/thimble to provide weathertight seal.

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