Breechings, Chimneys, and StacksME- Building Group

SECTION 235100 - BREECHINGS, CHIMNEYS, AND STACKS

PART 1 - GENERAL

1.1RELATED DOCUMENTS

  1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division01 Specification Sections, apply to this Section.

1.2SUMMARY

  1. This Section includes the following:
  2. Type B gas vents.
  3. Steel, positive-pressure, double-wall vents.
  4. Fabricated metal breechings.
  5. Mechanical-draft vent fans.
  6. Induced-draft fans.

1.3SUBMITTALS

  1. Product Data: For each type of product indicated. Include rated capacities; shipping, installed, and operating weights; furnished specialties; and accessories.
  2. Wiring Diagrams: Detail power, signal, and control systems and differentiate between manufacturer-installed and field-installed wiring.
  3. Welding Certificates: Copies of certificates for welding procedures and personnel.
  4. Maintenance Data: For vent fans to include in maintenance manuals.

1.4QUALITY ASSURANCE

  1. Welding Standards: Qualify procedures and personnel according to AWSD1.1, "Structural Welding Code--Steel," for hangers and supports, and AWSD9.1, "Sheet Metal Welding Code," for duct joint and seam welding.
  2. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA70, Article100, by a testing agency acceptable to authorities having jurisdiction.
  3. Comply with AWSD1.1 for welder qualifications, welding details, and workmanship standards.
  4. Comply with SMACNA's "Guide for Steel Stack Design and Construction."
  5. Comply with SMACNA's "HVAC Duct Construction Standards, Metal and Flexible" for fabricated breechings.

PART 2 - PRODUCTS

2.1MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. TypeB Gas Vents:
  3. American Metal Products; a Masco Company.
  4. General Products Co.; Air-Jet Div.
  5. Hart & Cooley, Inc.
  6. Selkirk Metalbestos.
  7. Simpson Dura-Vent Co., Inc.
  8. United McGill Corp.; Airflow Group.
  9. Van-Packer Co.
  10. Steel, Positive-Pressure, Double-Wall Vents:
  11. American Metal Products; a Masco Company.
  12. General Products Co.; Air-Jet Div.
  13. Hart & Cooley, Inc.
  14. Selkirk Metalbestos.
  15. Simpson Dura-Vent Co., Inc.
  16. Van-Packer Co.
  17. Thermally Actuated Vent Dampers:
  18. American Metal Products; a Masco Company.
  19. Induced-Draft Vent Fans:
  20. FAMCO.
  21. Field Controls.
  22. Metal Fab, Inc.
  23. Quickdraft; Div. of C. A. Litzler Co., Inc.
  24. Selkirk Metalbestos.
  25. Smith, Jay R. Manufacturing Co.
  26. Snappy Air Distribution Products.
  27. Tjernlund Products, Inc.
  28. Mechanical-Draft Vent Fans:
  29. FAMCO.
  30. Field Controls.
  31. Metal Fab, Inc.
  32. Selkirk Metalbestos.
  33. Smith, Jay R. Manufacturing Co.
  34. Snappy Air Distribution Products.
  35. Tjernlund Products, Inc.
  36. Van-Packer Co.

2.2TYPE B GAS VENTS

  1. Description: Double-wall gas vents complying with NFPA211, TypeB. Inner pipe of sheet aluminum, outer pipe of galvanized-steel sheet, each with the following minimum thicknesses:
  2. Round, 6-Inchand Smaller ID: 0.012-inchinner pipe, 0.0187-inchouter pipe.
  3. Round, 7- to 18-InchID: 0.014-inchinner pipe, 0.0187-inch outer pipe.
  4. Round, 20- to 24-InchID: 0.018-inchinner pipe, 0.0217-inchouter pipe.
  5. Oval, 4-Inchand Smaller Size: 0.012-inchinner pipe, 0.0187-inchouter pipe.
  6. Oval, 5- to 6-Inch Size: 0.014-inchinner pipe, 0.0187-inchouter pipe.
  7. Accessories: Tees, elbows, increasers, draft hood connectors, metal cap with bird barrier, adjustable roof flashing, storm collar, support assembly, thimbles, firestop spacers, and fasteners; fabricated of similar materials and designs as vent-pipe straight sections.

2.3STEEL, POSITIVE-PRESSURE, DOUBLE-WALL VENTS

  1. Description: Double-wall metal stacks complying with NFPA211, suitable for use with building heating equipment burning gas, solid, or liquid fuels.
  2. Construction: Inner and outer metal shells separated by at least 1-inchairspace, with positive sealing joints.
  3. Inner Shell: ASTMA666, Type304 stainless steel of the following thicknesses:
  4. 6- to 36-InchSize: 0.035 inch thick.
  5. 42- to 48-InchSize: 0.048 inch thick.
  6. Outer Jacket: Aluminum-coated steel of the following thicknesses:
  7. 6- to 24-InchSize: 0.025 inch thick.
  8. 26- to 48-InchSize: 0.034 inch thick.
  9. Accessories: Tees, elbows, increasers, draft hood connectors, termination, adjustable roof flashing, storm collar, support assembly, thimbles, firestop spacers, and fasteners; fabricated of similar materials and designs as vent-pipe straight sections.
  10. Termination: Stack cap designed to exclude 98 percent of rainfall.

2.4FABRICATED METAL BREECHINGS

  1. Breechings: Black, carbon, hot-rolled steel complying with ASTMA569/A569M; minimum metal thickness for corresponding sizes as indicated for the following diameters or long-side dimensions:
  2. 12 Inches and Smaller: 0.0478 inch
  3. 13 to 24 Inches: 0.0598 inch
  4. 25 to 36 Inches: 0.0747 inch
  5. 37 to 60 Inches: 0.1046 inch.
  6. Larger Than 60 Inches: 0.1345 inch
  7. Fabricate breechings in shop to minimize field welding. Match-mark sections for field assembly.
  8. Longitudinal Seams: Welded, except longitudinal seams for breechings less than 24 inches in diameter may be grooved with pipe-lock, flat-lock, or snap-lock seams.
  9. End Joints: Weld, lap, and bolt, or use companion flanges; except breechings less than 24 inches in diameter may have beaded and crimped joints.
  10. Fabricate elbows with centerline radius equal to associated breeching width. Limit angular tapers to 20 degrees maximum for expanding tapers. Install accessories during fabrication to greatest extent possible.
  11. Support Lug: Welded to fabricated breechings for attachment to building structure.
  12. Reinforce rectangular breeching with angle frames as follows for corresponding long-side dimensions:
  13. 30 Inches and Smaller: No reinforcement required.
  14. 31 to 36 Inches: 1-1/2 by 1-1/2 by 3/16 inch, 30 inches o.c.
  15. 37 to 60 Inches: 2 by 2 by 1/4 inch, 30 inches o.c.
  16. Reinforce round breechings with either flanged girth joints or angle frames as follows for corresponding diameter:
  17. 30 Inches and Smaller: No reinforcement required.
  18. 31 to 36 Inches: 1-1/2 by 1-1/2 by 3/16 inch, 30 inches o.c.
  19. 37 to 60 Inches: 2 by 2 by 1/4 inch, 30 inches o.c.
  20. Larger Than 60 Inches: 3 by 3 by 1/2 inch, 30 inches o.c.
  21. Barometric Dampers: Adjustable, self-actuating draft dampers, where indicated, full size of breeching.
  22. Cleanout Doors: Same weight as breeching, bolted and gasketed.
  23. Thermally Actuated Vent Dampers: Tested according to AGA standards, design certified to comply with ANSIZ21.66, and sized to match draft hood collar; constructed of stainless-steel housing and brackets with four quadrants secured to brackets constructed of corrosion-resistant bimetal. Brass weights secured to quadrants to prevent vibrations and noise during high-draft conditions.

2.5GUYING AND BRACING MATERIALS

  1. Cable: Galvanized, stranded wire of the following thickness:
  2. Minimum Size: 1/4 inch in diameter.
  3. For ID Sizes 4 to 15 Inches: 5/16 inch in diameter.
  4. For ID Sizes 18 to 24 inches: 3/8 inch in diameter.
  5. For ID Sizes 27 to 30 inches: 7/16 inch in diameter.
  6. For ID Sizes 33 to 36 inches: 1/2 inch in diameter.
  7. For ID Sizes 39 to 48 inches: 9/16 inch in diameter.
  8. Pipe: 1-1/4-inch-diameter, galvanized steel.
  9. Angle Iron: Galvanized steel 1-1/2 by 1-1/2 by 3/16 inch

2.6INDUCED-DRAFT VENT FANS

  1. Fabrication: Enameled-steel venturi tube for sizes 20 inches and smaller in diameter, and ASTMA666, Type304 stainless-steel venturi tube for sizes 22 to 48 inches in diameter.
  2. Fan: Radial-blade venturi type, with motor.
  3. Fan Motor: Refer to Division23 Section "Common Motor Requirements for HVAC Equipment" for factory-installed motors.
  4. Accessories: Provide the following:
  5. Tapered extension.
  6. Straight extension.
  7. Cylindrical storm shield.
  8. High wind cap..
  9. Curb cap.
  10. Shock (flexible) connector.
  11. Volume damper.
  12. Blast gate damper.
  13. Vibration isolators.

2.7MECHANICAL-DRAFT VENT FANS

  1. Forward-curved or radial-blade fan and scroll fabricated of mild steel with direct-drive, shaded-pole motor with ball bearings, internal cooling fan, stainless-steel shaft, and integral pressure-sensing switch.
  2. Fan Motor: Refer to Division23 Section "Common Motor Requirements for HVAC Equipment" for factory-installed motors.
  3. Accessories: Provide the following:
  4. Water heater control, including safety interlock controls.
  5. Secondary safety switch.
  6. Post purge kit.
  7. Gas spillage sensing kit.
  8. Wall vent hood.

PART 3 - EXECUTION

3.1INSTALLATION OF MANUFACTURED BREECHINGS, CHIMNEYS, AND STACKS

  1. Install according to manufacturer's written instructions. Locate to comply with minimum clearances from combustibles.
  2. Seal between sections of positive-pressure vents according to manufacturer's written installation instructions, using sealants recommended by manufacturer.
  3. Support vents at intervals recommended by the manufacturer to support weight of vent and all accessories, without exceeding loading of appliances.
  4. Where maximum unsupported lengths of stack are exceeded, support chimneys with guy wires.

3.2INSTALLATION OF FABRICATED BREECHINGS

  1. Install concrete inserts in formwork to support breeching independent of its appliance connection.
  2. Assemble and erect fabricated breechings according to SMACNA's "HVAC Duct Construction Standards, Metal and Flexible."
  3. Install, support, and restrain according to requirements of seismic zone.
  4. Align breechings at connections, with smooth internal surface and 1/8-inch misalignment tolerance.
  5. Slope breechings down to appliance, with condensate drain connection at lowest point piped to nearest drain.
  6. Install accessories, dampers, fans, equipment, controls, and other supports.
  7. Anchor breechings to building structure with bolts, concrete inserts, steel expansion anchors, welded studs, C-clamps, or special beam clamps.
  8. Support vertical stacks at 12-footintervals by attaching to adjacent vertical structural surfaces or by direct bearing at floor penetrations and similar locations.
  9. 24 by 20 Inches and Smaller: Use straps or formed angles 1-1/2 by 0.0598 inch
  10. Larger Than 24 by 20 Inches: Use steel angle brackets 1 by 1/8 inch for sizes 36 by 18 inches or smaller; 1-1/2 by 1/8 inch for larger sizes.
  11. Support horizontal breechings located against structural walls and other similar adjacent vertical surfaces at 96-inchintervals for units with horizontal dimensions of 40 inches and smaller, and at 48-inchintervals for larger breechings.
  12. Where Width Is Less Than Height: With straps 1-1/2 by 0.0598 inch
  13. Where Width Is More Than Height: With shelf-type fabricated angle brackets; 1 by 1/8 inch for widths 18 inches and smaller; 1-1/2 by 1/8 inch for larger widths.
  14. Support horizontal rectangular breechings from overhead structure with bolted hangers at 120-inchintervals for unit widths 60 inches and smaller, and 96-inchintervals for larger breechings.
  15. Breechings 60 Inches and Smaller in Width: Straps 1 by 0.0598 inch Trapeze Hangers: Support breechings with horizontal angles and vertical supports according to the following long-side dimensions:
  16. 30-Inchand Smaller Size: 1-by-1/8-inchangle, with 1-by-0.0478-inch-or 1/4-inch-diameter hangers.
  17. 31- to 60-InchSize: 1-1/2-by-1/8-inchangle, with 1-1/2-by-0.0598-inch-or 3/8-inch-diameter hangers.
  18. Support horizontal round breechings with girth strap and strap hanger (of same size). Install pair of strap hangers bolted to opposite sides of angle reinforcing rings or flanged joints. Support breechings at 120-inch intervals with hangers as follows for corresponding diameters:
  19. 30 Inch and Smaller Diameter: Strap hangers 1 by 0.0598 inch
  20. 31- to 50-Inch Diameter: Strap hangers 1-1/2 by 0.0598 inch

3.3INSTALLATION OF DAMPERS

  1. Install barometric and thermostatically operated dampers according to manufacturer's written instructions. Locate as close to draft hood collar as possible.

3.4INSTALLATION OF FANS

  1. Install fans according to manufacturer's written instructions.
  2. Secure fans to appliances, breechings, or stacks with hardware matching connected materials.
  3. Install units with clearances for service and maintenance.

3.5CLEANING

  1. After completing system installation, including terminals, inspect exposed finishes. Remove paint splatters and other spots, dirt, and debris. Repair damaged finish to match original finish.
  2. Clean breechings internally, during and on completion of installation, to remove dust and debris. Clean external surfaces to remove welding slag and mill film. Grind welds smooth.
  3. Provide temporary closures at ends of breechings and chimneys that are not completed or connected to equipment.

3.6COMMISSIONING

  1. Verify that fans are installed and connected according to the Contract Documents.
  2. Complete installation and startup checks according to manufacturer's written instructions, and confirm fan interlocks.

END OF SECTION

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Revision Date: 01/21/14 Project & Bid Package

File name: 235100 BREECHINGS, CHIMNEYS, AND STACKS