[SUBMITTAL INFORMATION]

DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS

Color-highlighted text

Yellow: Editor’s Notes. Comments inserted into the text are addressed to the A/E, not the Contractor. Editor’s Notes are formatted as hidden text. Editor’s Notes are not identified with an update. Do not print Editor’s Notes in issue for distribution to Bidders/Contractors.

Tip: To not print Editor’s Notes (hidden text) in document choose Tools on Menu bar, click Options, Print tab, under Include with document, uncheck Hidden text (check to print text), click OK. Save.

Tip: To view Editor’s Notes (hidden text) in a document choose Tools on Menu bar, click Options, View tab, under Formatting marks, check Hidden text (uncheck to hide text), click OK. Save.

Red: Text updated in 1st quarter. April – June.

Strikethrough text and highlighting (not text) in previously issued quarters are deleted. Only 1st quarter highlighted updated text is indicated.

Turquoise: Text updated in 2nd quarter. July – September.

1st quarter updated text remains highlighted.

Pink: Text updated in 3rd quarter. October – December.

1st and 2nd quarter updated text remain highlighted.

Bright Green: Text updated in 4th quarter. January – March.

1st, 2nd and 3rd quarter updated text remains highlighted.

Text Editing

Select options [in brackets] and edit <notes> before issuing specifications for distribution to Bidders/Contractors.

Delete Strikethrough text.

Tip: To delete strikethrough text, choose Edit on Menu bar, click Find, Find tab, More (Search Options opens), select All, click Format, Font, check Strikethrough, OK.

Click Replace tab, Replace All, OK, Close. Save.

Delete all highlighting of text from issue to be distributed to Bidders/Contractors.

Tip: To delete highlighting, locate cursor at beginning of Section and block all text in Section, press Shift + Control + End, click No Highlight icon on Formatting toolbar. Save.

IMPORTANT: Retain month and year under section title on first page indicating updated Guide Specification Section issue used.

Note: This page will not print when Hidden text is unchecked as indicated in Editor’s Notes Tip.

IF THE HIDDEN GUIDE SPECIFICATION CONVENTIONS DO NOT APPEAR PRECEEDING THIS

NOTE, TURN THEM ON AS FOLLOWS.

FOR MICROSOFT WORD 2000 and 2003, CLICK ON SHOW/HIDE ICON IN MENU BAR OR CHOOSE

TOOLS IN MENU BAR. THEN CLICK OPTIONS, VIEW TAB, UNDER FORMATTING MARKS, CHECK

HIDDEN TEXT.

FOR MICROSOFT WORD 2007, CLICK ON MICROSOFT OFFICE ICON LOCATED IN UPPER LEFT

CORNER OF MENU BAR. CLICK ON WORD OPTIONS AT BOTTOM OF DROP DOWN. THEN CLICK

ON DISPLAY. CHECK THE HIDDEN TEXT BOX.

FOR MICROSOFT OFFICE 2010, CLICK ON FILE BUTTON LOCATED IN UPPER LEFT CORNER OF

MENU BAR. IN THE DROP DOWN, CLICK ON OPTIONS, AND A WORD OPTIONS BOX WILL

APPEAR. CLICK ON DISPLAY. CHECK THE HIDDEN TEXT BOX.

THE GUIDE SPECIFICATION CONVENTIONS SHOULD NOW BE VISIBLE IN THE DOCUMENT.

(Delete this note before printing.)

SECTION 233113

METAL DUCTS AND AIR ACCESSORIES

(Edited from DeCA June 2017 Design Criteria)

PART 1 - GENERAL

1.1  SUMMARY

  1. Section Includes:
  2. Metal ductwork.
  3. Casing and plenums.
  4. Duct cleaning.
  5. Air turning devices.
  6. Fire dampers.
  7. Smoke dampers.
  8. Duct access doors.
  9. Duct test holes.
  10. Flexible duct connections.
  11. Volume control dampers.
  12. Motorized dampers.
  13. Damper motors.
  14. Related Sections:
  15. Division 01 Section Mechanical, Refrigeration, Food Service Equipment and Electrical Coordination.
  16. Division 01 Section Quality Control.
  17. Division 01 Section Closeout Procedures.
  18. Division 23 Section Hangers and Supports for HVAC Piping and Equipment.
  19. Division 23 Section Vibration and Seismic Controls for HVAC Piping and Equipment.
  20. Division 23 Section Duct Insulation.
  21. Division 23 Section Diffusers, Registers, and Grilles.
  22. Division 23 Section Testing, Adjusting and Balancing for HVAC.
  23. Division 26 Electrical.

1.2  QUALITY CONTROL

  1. The following publications form a part of this Specification to the extent they are applicable:
  2. Division 01 Section Quality Control.
  3. ASTM A 36 - Structural Steel.
  4. ASTM A 90 - Weight of Coating on Zinc-Coated (Galvanized) Iron or Steel Articles.
  5. ASTM A 366 - Steel, Sheet, Carbon, Cold Rolled, Commercial Quality.
  6. ASTM A 525 - General Requirements for Steel Sheet, Zinc- Coated (Galvanized) by the Hot-Dip Process.
  7. ASTM A 653 - Steel Sheet, Zinc-Coated (Galvanized) by HotDip Process, Lock Forming Quality.
  8. ASTM A 568 - Steel, Sheet, Carbon, and HighStrength, Low-Alloy, Hot-Rolled and Cold-Rolled.
  9. ASTM A 569 - Steel, Carbon (0.15 Maximum, Percent), Hot-Rolled Sheet and Strip, Commercial Quality.
  10. ASTM B209 - Aluminum and Aluminum-Alloy Sheet and Plate.
  11. NFPA 90A - Installation of Air Conditioning and Ventilating Systems.
  12. NFPA 90B - Installation of Warm Air Heating and Air Conditioning Systems.
  13. NFPA 96 - Ventilation of Commercial Kitchens.
  14. SMACNA - HVAC Air Duct Leakage Test Manual.
  15. SMACNA - HVAC Duct Construction Standards - Metal and Flexible.
  16. UL 555 - Fire Dampers and Ceiling Dampers.
  17. UL 33 - Heat Responsive Links for Fire Protection Services.

1.3  PERFORMANCE REQUIREMENTS

  1. No variation of duct configuration or sizes permitted except by written permission. Size round ducts installed in place of rectangular ducts in accordance with ASHRAE table of equivalent rectangular and round ducts.

1.4  SUBMITTALS

  1. Submittals During Construction:
  2. Submit under provisions of Division 01 Section Quality Control.
  3. Test Reports: Indicate pressure tests performed. Include date; section tested, test pressure, and leakage rate, following SMACNA HVAC Air Duct Leakage Test Manual.
  4. Operation and Maintenance data.
  5. Submittals at Project Closeout:
  6. Division 01 Section Closeout Procedures.
  7. Record actual locations of ducts and duct fittings. Record changes in fitting location and type. Show additional fittings used.
  8. The Contractor shall submit all certifications and testing data as a supplement to previously submitted O & M manuals at contract closeout.
  9. LEED Submittals:
  10. Product Data for PrerequisiteEQ1: Documentation indicating that duct systems comply with ASHRAE62.1, Section 5 - "Systems and Equipment."
  11. Product Data for PrerequisiteEA2: Documentation indicating that duct systems comply with ASHRAE/IESNA90.1, Section 6.4.4 - "HVAC System Construction and Insulation."

Retain first subparagraph below if leak testing is retained in "Field Quality Control" Article.

  1. Leakage Test Report for PrerequisiteEA2: Documentation of work performed for compliance with ASHRAE/IESNA90.1, Section 6.4.4.2.2 - "Duct Leakage Tests."

Retain first subparagraph below if retaining "Duct Cleaning" Article.

  1. Duct-Cleaning Test Report for PrerequisiteEQ1: Documentation of work performed for compliance with ASHRAE 62.1, Section 7.2.4 - "Ventilation System Start-Up."

"Product Data for CreditEQ4.1" Subparagraph below applies to LEED-NC, LEED-CI, and LEED-CS; coordinate with requirements for adhesives and sealants.

  1. Product Data for CreditEQ4.1: For adhesives and sealants, documentation including printed statement of VOC content.

"Laboratory Test Reports for CreditEQ4" Subparagraph below applies to LEED for Schools.

  1. Laboratory Test Reports for CreditEQ4: For adhesives and sealants, documentation indicating that products comply with the testing and product requirements of the California Department of Health Services' "Standard Practice for the Testing of Volatile Organic Emissions from Various Sources Using Small-Scale Environmental Chambers."

1.5  QUALITY ASSURANCE

  1. Perform Work in accordance with SMACNA - HVAC Duct Construction Standards - Metal and Flexible.

1.6  REGULATORY REQUIREMENTS

  1. Construct ductwork to NFPA 90A and NFPA 90B standards.

1.7  ENVIRONMENTAL REQUIREMENTS

  1. Do not install duct sealants when temperatures are less than those recommended by sealant manufacturers.
  2. Maintain temperatures during and after installation of duct sealants.

1.8  DELIVERY, STORAGE, AND HANDLING

  1. Protect dampers from damage to operating linkages and blades.

PART 2 - PRODUCTS

2.1  MATERIALS

  1. Galvanized Steel Ducts: ASTM A525 and ASTM A527 galvanized steel sheet, lockforming quality, having zinc coating of in conformance with ASTM A90.
  2. Insulated Flexible Ducts:
  3. Two ply vinyl film supported by helically wound spring steel wire; fiberglass insulation; polyethylene vapor barrier film.
  4. Pressure Rating: 4 inches WG positive and 1.0 inches WG negative.
  5. Maximum Velocity: 4000 fpm.
  6. Temperature Range: Minus 10 deg F to 160 deg F.
  7. Kitchen exhaust ducts shall be black steel where concealed, stainless steel where exposed. Joints shall be welded liquid tight.
  8. Sealant:
  9. Nonhardening, water resistant, fire resistive, compatible with mating materials; liquid used alone or with tape, or heavy mastic.
  10. Low Volatile Organic Content (VOC).
  11. Hanger Rod: ASTM A36; steel; threaded both ends, threaded one end, or continuously threaded.

2.2  DUCTWORK FABRICATION

  1. Fabricate and support in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible, and as indicated. Provide duct material, gages, reinforcing, and sealing for operating pressures indicated.
  2. Construct T's, bends, and elbows with radius of not less than 1-1/2 times width of duct on centerline. Where not possible and where rectangular elbows are used, provide air foil turning vanes. Where acoustical lining is indicated, provide turning vanes of perforated metal with glass fiber insulation.
  3. Increase duct sizes gradually, not exceeding 15 degrees divergence wherever possible; maximum 30 degrees divergence upstream of equipment and 45 degrees convergence downstream.

******Edit for concealed duct. Preinsulated duct to be used when duct is exposed only******

  1. All [exposed] round duct shall be spiral lock seam, [double wall insulated with 1 inch minimum of K=.25, 3lb/sq.ft fiber glass insulation with cleanable, noneroding, antimicrobial coating, and galvaneal outer duct ready for painting. Fabricate round and oval duct fittings two gages heavier than duct gages indicated in SMACNA Standard. Joints shall be minimum 4 inch cemented slip joint, brazed or electric welded. Prime coat welded joints. Package exposed duct so as to prevent shipping damage.]
  2. Provide standard 45 degree lateral wye takeoffs unless otherwise indicated where 90 degree conical tee connections may be used.

2.3  AIR TURNING DEVICES

  1. Multi-blade device with blades aligned in short dimension; steel or aluminum construction; with individually adjustable blades, mounting straps.

2.4  FIRE DAMPERS

  1. Fabricate in accordance with NFPA 90A and UL 555, and as indicated.
  2. Ceiling Dampers: Galvanized steel, 22 gage frame and 16 gage flap, two layers 0.125 inch ceramic fiber on top side, [and one layer on bottom side for round flaps], with locking clip.
  3. Horizontal Dampers: Galvanized steel, 22 gage frame, stainless steel closure spring, and lightweight, heat retardant non-asbestos fabric blanket.
  4. Curtain Type Dampers: Galvanized steel with interlocking blades. Provide stainless steel closure springs and latches for [horizontal installations] [closure under air flow conditions]. Configure with blades out of air stream except for [1.0 inch [______] pressure class ducts up to 12 inches in height.
  5. Multiple Blade Dampers: 16 gage galvanized steel frame and blades, oil-impregnated bronze or stainless steel sleeve bearings and plated steel axles, 1/8 by 1/2 inch plated steel concealed linkage, stainless steel closure spring, blade stops and lock.
  6. Fusible Links: UL 33, separate at [160] [212] [_____] degrees F with adjustable link straps for combination fire/balancing dampers.

2.5  SMOKE DAMPERS

  1. Fabricate in accordance with NFPA 90A, UL 555, UL 555S, and as indicated.
  2. Provide factory sleeve and collar for each damper.
  3. Multiple Blade Dampers: Fabricate with 16 gage galvanized steel frame and blades, oilimpregnated bronze or stainless steel sleeve bearings and plated steel axles, stainless steel jamb seals, 1/8 by 1/2 inch plated steel concealed linkage, stainless steel closure spring, blade stops, and lock, and 1/2 inch actuator shaft.

2.6  DUCT ACCESS DOORS

  1. Fabricate in accordance with SMACNA HVAC Duct Construction Standards - Metal and Flexible, and as indicated.
  2. Fabrication: Rigid and close-fitting of galvanized steel with sealing gaskets and quick fastening locking devices. For insulated ductwork, install minimum 1 inch thick insulation with sheet metal cover.
  3. Less Than 12 Inches Square: Secure with sash locks.
  4. Up to 18 Inches Square: Provide two hinges and two sash locks.
  5. Up to 24 by 48 Inches: Three hinges and two compression latches [with outside and inside handles].
  6. Larger Sizes: Provide an additional hinge.
  7. Sash lock.
  8. Hinge.
  9. Access doors with sheet metal screw fasteners are not acceptable.

2.7  DUCT TEST HOLES

  1. Temporary Test Holes: Cut or drill in ducts as required. Cap with neat patches, neoprene plugs, threaded plugs, or threaded or twiston metal caps.
  2. Permanent Test Holes: Factory fabricated, air tight flanged fittings with screw cap. Provide extended neck fittings to clear insulation.

2.8  FLEXIBLE DUCT CONNECTIONS

  1. Fabricate in accordance with SMACNA HVAC Duct Construction Standards Metal and Flexible, and as indicated.
  2. Connector: Fabric crimped into metal edging strip.
  3. Fabric: UL listed fire-retardant neoprene coated woven glass fiber fabric to NFPA 90A, minimum density 30 oz per sq yd.
  4. Net Fabric Width: Approximately 6 inches wide.
  5. Metal: 3 inch wide, 24 gage galvanized steel.

2.9  MANUAL VOLUME DAMPERS

Show dampers on Drawings. If both standard and low-leakage volume dampers are required, identify each damper type on Drawings.

  1. Standard, Steel, Manual Volume Dampers:

See Editing Instruction No.1 in the Evaluations for cautions about naming manufacturers. Retain first subparagraph and list of manufacturers below. See Division01 Section "Product Requirements."

  1. Standard leakage rating,with linkage outside airstream.
  2. Suitable for horizontal or vertical applications.
  3. Frames:
  4. Hat-shaped, galvanized-steel channels, 0.064-inch minimum thickness.
  5. Mitered and welded corners.
  6. Flanges for attaching to walls and flangeless frames for installing in ducts.
  7. Blades:
  8. Multiple or single blade.
  9. Parallel- or opposed-blade design.
  10. Stiffen damper blades for stability.
  11. Galvanized-steel, 0.064 inch thick.
  12. Blade Axles: Galvanized steel.
  13. Bearings:
  14. Oil-impregnated bronze.
  15. Dampers in ducts with pressure classes of 3-inch wg or less shall have axles full length of damper blades and bearings at both ends of operating shaft.
  16. Tie Bars and Brackets: Galvanized steel.

Retain first paragraph below for aluminum ducts. Coordinate with "Installation" Article and Division23 Section "Metal Ducts."

  1. Standard, Aluminum, Manual Volume Dampers:

See Editing Instruction No.1 in the Evaluations for cautions about naming manufacturers. Retain first subparagraph and list of manufacturers below. See Division01 Section "Product Requirements."

  1. Standard leakage rating,with linkage outside airstream.
  2. Suitable for horizontal or vertical applications.
  3. Frames: Hat-shaped, 0.10-inch- thick, aluminum sheet channels; frames with flanges for attaching to walls and flangeless frames for installing in ducts.
  4. Blades:
  5. Multiple or single blade.
  6. Parallel- or opposed-blade design.
  7. Stiffen damper blades for stability.

Retain one of first two subparagraphs below.