SECTION 233119 - HVAC CASINGS Updated 7/2016

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. Section Includes:
  2. [Factory] [Shop] -fabricated, field-assembled, [single] [double] [single and double]wall casings for HVAC equipment.

1.3REFERENCE STANDARDS

  1. ASTM International (ASTM).
  2. American Society of Heating, Refrigerating, and Air Conditioning Engineers, Inc. (ASHRAE).
  3. North American Insulation Manufacturers Association (NAIMA).
  4. National Fire Protection Association (NFPA).
  5. Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA).
  6. Underwriter's Laboratories (UL).
  7. Underwriter's Laboratories Environmental (UL Environment).
  8. UL 2824 – GREENGUARD Certification Program Method for Measuring Microbial Resistance from Various Sources Using Static Environmental Chambers.

1.4DEFINITIONS

  1. Thermal Conductivity (K value): Units of Btu-inch/hour per square foot per degree F.
  2. UL GREENGUARD: Provides independent thirdparty, Indoor Air Quality (IAQ) certification of products for emissions of respirable particles and Volatile Organic Compounds (VOC's), including formaldehyde and other specific productrelated pollutants. Certification is based upon criteria used by EPA, OSHA, and WHO.
  3. EPA: Environmental Protection Agency.
  4. WHO: World Health Organization.
  5. FSK: Foil Scrim Kraft; jacketing.
  6. PVC: Polyvinyl Chloride.
  7. Glass Mineral Wool: Interchangeable with fiber glass, but replacing the term in the attempt to disassociate and differentiate Glass Mineral Wool from the potential health and safety risk of special purpose or reinforcement products that do not meet the bio solubility criteria of insulation made from glass. Rock Mineral Wool will replace the traditional Mineral Wool label. Both are used in lieu of the Mineral Fiber label.
  8. ECOSE® Technology: a revolutionary binder chemistry that enhances the sustainability of products. The "binder" is the bond that holds the Glass Mineral Wool product together and gives the product its shape and brown color. ECOSE Technology is a plantbasedsustainable chemistry that replaces the phenol/formaldehyde (PF) binder traditionally used in Glass Mineral Wool products. Products using ECOSE Technology are formaldehydefree and have greater reduced global warming potential than compared to products of the past.
  9. UL GREENGUARD Gold Certification: (formerly known as GREENGUARD Children & Schools Certification) offers stricter certification criteria, considers safety factors to account for sensitive individuals (such as children and the elderly), and ensures that a product is acceptable for use in environments such as schools and healthcare facilities. It is referenced; by both The Collaborative for High Performance Schools (CHPS) and the Leadership in Energy Environmental Design (LEED) Building Rating Systems.
  10. UL Environment Formaldehyde Free Verification Requirements: For a product to be verified as formaldehyde free, product samples must have a measured emission factor of less than or equal to 5 µg/m²h at 24 elapsed hours or 3 µg/m²h at 336 elapsed hours. An emission factor of
    5 µg/m²h corresponds to measured chamber concentration of 2.5 µg/m³ for a typical building ratio of 0.5 m²/m³. This chamber concentration is comparable to, or below typical outdoor air concentrations. This demonstrates that the formaldehyde exposure from products labeled as formaldehyde free will not contribute to airborne formaldehyde concentrations at greater levels than those found in the natural outdoor environment.
  11. Declare and The Living Building Challenge – The Living Building Challenge is a philosophy, advocacy tool and certification program that addresses development at all scales. The purpose of The Living Building Challenge is to define the most advanced measure of sustainability in the built environment today and acts to diminish the gap between current limits and ideal solutions. Declare supports The Living Building Challenge by providing a transparent materials database that project teams can select from to meet Imperative 11.
  12. Imperative 11, Red List – requires that manufacturers disclose the ingredients in their products to insure that they are free of Red List chemicals and materials. The Red List represents the “worst in class” materials, chemicals and elements known to pose serious risks to human health and the greater ecosystem.
  13. Underwriter’s Laboratories Environment (UL Environment): offers independent green claims validation, product assessment and certification. UL GREENGUARD provides thirdparty credibility for sustainable products.
  14. UL Environment Claims Validation (ECV): service and label tests a manufacturer’s product and validates that the environmental claims they make in their marketing and packaging materials are factual. This Environmental Claims Validation (ECV) service will allow manufacturers to verify that their products contain a quantifiable amount of recycled content and, as such, help limit raw material extraction and reduce landfill waste. It also will enable products to qualify for LEED® points under Pilot Credit 43: MR – Certified Products.
  15. EUCEB: exonerated fiber from a health and safety standpoint by the European Certification Board process.
  16. Recycled Content: materials such as bottled glass collected at curbside or other collection sites after consumer use and/or materials used or created from one manufacturing process which are collected as scrap and placed back into another manufacturing process rather than being placed in a landfill or incinerated.
  17. Polybrominated diphenyl ethers (PBDE) such as Penta-BDE, Octa-BDE or Deca-BDE fire retardants: have been linked to adverse health effects after exposure in low concentrations.
  18. UL Classified: UL has tested and evaluated samples of the product with respect to certain properties of the product. UL Classifies products to:
  19. Applicable UL requirements.
  20. Standards for safety.
  21. Standards of other National and International organizations.
  22. EPD: Environmental Product Declaration. A third party verified document that reports environmental data of products based on the Life Cycle Assessment (LCA) and other relevant information, and in accordance with the International Standard ISO 14025 (Type III Environmental Declarations).

1.5PERFORMANCE REQUIREMENTS

  1. StaticPressure Classes:
  2. Upstream from Fan(s):[2inch wg (500 Pa)] <Insert value>.
  3. Downstream from Fan(s):[2inch wg (500 Pa)] [3inch wg (750 Pa)]
    [4inch wg (1000 Pa)] [6inch wg (1500 Pa)] [10inch wg (2500 Pa)] <Insert value>.
  4. Acoustical Performance:
  5. NRC:[1.09] [0.94] <Insert number> according to ASTMC423.
  6. STC:[40] [34] <Insert number> according to ASTME90.
  7. Structural Performance:
  8. Casings shall be fabricated to withstand 133 percent of the indicated static pressure without structural failure.Wall and roof deflection at the indicated static pressure shall not exceed 1/8 inch per foot (0.97 mm per meter) of width.
  9. Fabricate outdoor casings to withstand wind load of 15 lbf/sq.ft. (720N/sq.m) and snow load of 30 lbf/sq.ft. (1440N/sq.m).
  10. Seismic Performance:HVAC casings shall withstand the effects of earthquake motions determined according to SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" [and] [ASCE/SEI7] <Insert requirement>.
  11. The term "withstand" means "the unit will remain in place without separation of any parts from the device when subjected to the seismic forces specified[and the unit will be fully operational after the seismic event]."

1.6ACTION SUBMITTALS

  1. Product Data:For each type of the following products:
  2. Factory-fabricated casings.
  3. Liners and adhesives.
  4. Sealants and gaskets.
  5. Seismicrestraint devices.
  6. EPD Submittals: As certified by UL Environment.
  7. LEED Submittals:
  8. Product Data for PrerequisiteIEQ1:Documentation indicating that HVAC casings comply with ASHRAE62.1, Section5 - "Systems and Equipment."
  9. Product Data for PrerequisiteEA2:Documentation indicating that HVAC casings comply with ASHRAE/IESNA90.1, Section6.4.4 - "HVAC System Construction and Insulation."
  10. Leakage Test Report for PrerequisiteEA2:Documentation of work performed for compliance with ASHRAE/IESNA90.1, Section6.4.4.2.2 - "Duct Leakage Tests."
  11. Duct Cleaning Test Report for PrerequisiteIEQ1:Documentation of work performed for compliance with ASHRAE62.1, Section7.2.4 - "Ventilation System Start-up."
  12. Product Data for CreditIEQ4.1:For adhesives and sealants, documentation including printed statement of VOC content.
  13. Laboratory Test Reports for CreditIEQ4: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."
  14. Product Data for Credit MR 5 Regional Materials: For products and materials to comply with requirements for regional materials, provide documentation indicating location of product or material manufacturing location and the point of extraction, harvest, or recovery for each raw material. Include distance to Project, contractor cost for each regional material, and percent by weight that is considered regional.
  15. LEED v 4, Product Data for Credit EA 2: For products and materials significant to the energy performance of a structure, provide documentation that indicates that insulation levels are significant to increasing the level of energy performance beyond the prerequisite standard.
  16. LEED v 4, Product Data for Credit MR 2: For products and materials to comply with Building Product Disclosure & Optimization, provide data/evidence that substantiates Environmental Product Declaration and Multi Attribute Optimization requirements.
  17. LEED v 4: Product Data for Credit MR 3: For products and materials to comply with requirements for regional materials, provide documentation indicating location of product or material, manufacturing location and the point of extraction, harvest, or recovery for each raw material. Include distance to Project, contractor cost for each regional material, and percent by weight that is considered regional.
  18. LEED v 4, Product Data for Credit MR 4: For products having recycled content documentation; indicating percentages by weight of post-consumer and pre-consumer recycled content. Include statement indicating cost for each product having recycled content.
  19. LEED v 4, Product Data for Credit EQ 2: For products and materials to comply with low emittance standards, provide documentation substantiating that insulation products comply with requisite low emittance standards.
  20. LEED v 4, Product Data for Credit EQ 5: For products and materials to meet the standard for both thermal comfort design and thermal comfort control, provide data to support; that insulation products are significant to thermal comfort design and thermal comfort control.
  21. LEED v 4, Product Data for Credit EQ 9: For products and materials that contribute to the design and performance of workspaces that promote occupants well-being, productivity, and communication, provide data/documentation supporting acoustical benefits of Glass Mineral Wool insulation products.
  22. Shop Drawings:For HVAC casings.Include plans, elevations, sections, components, and attachments to other work.
  23. Detail HVAC casing assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.
  24. Sheet metal thickness(es).
  25. Reinforcement and spacing.
  26. Seam and joint construction.
  27. Access doors including frames, hinges, and latches.
  28. Filter, coil, humidifier, and other apparatus being installed in and mounted on casing.
  29. Locations for access to internal components.
  30. Hangers and supports including methods for building attachment, vibration isolation,[seismic restraints] and casing attachment.
  31. Interior lighting, including switches.

1.7INFORMATIONAL SUBMITTALS

  1. Welding certificates.
  2. Product Certificates:For acoustically critical casings, from manufacturer.
  3. Show soundabsorption coefficients in each octave band lower than those scheduled when tested according to ASTMC423.
  4. Show airborne sound transmission losses lower than those scheduled when tested according to ASTME90.
  5. Field qualitycontrol reports.

1.8QUALITY ASSURANCE

  1. Welding Qualifications:Qualify procedures and personnel according to [AWSD1.1/D1.1M, "Structural Welding Code - Steel," for hangers and supports] [AWSD9.1M/D9.1, "Sheet Metal Welding Code," for casing joint and seam welding].
  2. Welding Qualifications:Qualify procedures and personnel according to the following:
  3. AWSD1.1/D1.1M, "Structural Welding Code - Steel," for hangers and supports.
  4. AWSD9.1M/D9.1, "Sheet Metal Welding Code," for casing joint and seam welding.
  5. ASHRAE Compliance:Applicable requirements in ASHRAE62.1, Section5 - "Systems and Equipment" and Section7 - "Construction and System Start-up."
  6. ASHRAE/IESNA Compliance:Applicable requirements in ASHRAE/IESNA90.1, Section6.4.4 - "HVAC System Construction and Insulation."
  7. Surface Burning Characteristics: For insulation and related materials, UL/ULC Classified per UL 723 or meeting ASTM E 84, by a testing agency acceptable to authorities having jurisdiction. Factory label insulation and jacket materials and adhesive, mastic, tapes, and cement material containers, with appropriate markings of applicable testing agency.
  8. Insulation Installed Indoors: Flame spread index of 25 or less, and smoke developed index of 50 or less.
  9. Insulation Installed Outdoors: Flame spread index of 75 or less, and smoke developed index of 150 or less.
  10. Formaldehyde Free Third Party certified with UL Environmental Validation.
  11. Biosoluble: As determined by research conducted by the International Agency for Research on Cancer (IARC) and supported by revised reports from the National Toxicology Program (NTP) and the California Office of Environmental Health Hazard Assessment. Certified by European Certification Board for Mineral Wool Products (EUCEB).
  12. Recycled Content: A minimum or 50 percent recycled glass content certified and UL Validated.
  13. Low Emitting Materials: For all thermal and acoustical applications of Glass Mineral Wool Insulation Products, provide materials complying with the testing and products requirements of UL GREENGUARD Gold Certification.
  14. LivingBuilding Challenge - Declare Red List Free.
  15. Products shall contain no polybrominated diphenyl ethers (PBDE) such as Penta-BDE, Octa-BDE or Deca-BDE fire retardants; whenever available.

1.9COORDINATION

  1. Coordinate sizes and locations of concrete bases with actual equipment provided.Cast anchorbolt inserts into bases.Concrete, reinforcement, and formwork requirements are specified in [Section033000 "CastinPlace Concrete."] [Section033053 "Miscellaneous CastinPlace Concrete."]
  2. Coordinate sizes and locations of steel supports.Supports are specified in Section055000 "Metal Fabrications."
  3. Coordinate installation of roof curbs, [equipment supports]and roof penetrations.These items are specified in Section077200 "Roof Accessories."

PART 2 - PRODUCTS

2.1GENERAL CASING FABRICATION REQUIREMENTS

  1. General Material Requirements:Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Chapter9, "Equipment and Casings," for acceptable materials, material thicknesses, and casing construction methods unless otherwise indicated.Sheet metal materials shall be free of pitting, seam marks, roller marks, stains, discolorations, and other imperfections.
  2. Fabricate casings with more than 3inch wg (750Pa) negative static pressure according to SMACNA's "Rectangular Industrial Duct Construction Standards."
  3. Casings with more than 2inch wg (500Pa) positive static pressure may be fabricated according to SMACNA's "Rectangular Industrial Duct Construction Standards."
  4. Galvanized Sheet Steel:Comply with ASTMA653/A653M.
  5. Exterior Surface Galvanized Coating Designation:[G60 (Z180)] [G90 (Z275)].
  6. Interior Surface Galvanized Coating Designation:
  7. Sections Not Exposed to Moisture:[G60 (Z180)] [G90 (Z275)].
  8. Sections Housing and Downstream from Cooling Coil and Humidifiers:
    [G90 (Z275)].
  9. Stainless Steel:ASTMA480/A480M, [Type304] [Type316], and having a[No.2D]
    Insert finish> finish.
  10. Factory or ShopApplied Antimicrobial Coating:
  11. Apply to the interior sheet metal surfaces of casing in contact with the airstream.Apply untreated clear coating to the exterior surface.
  12. Antimicrobial compound shall be tested for efficacy by an NRTL and registered by the EPA for use in HVAC systems.
  13. Coating containing the antimicrobial compound shall have a hardness of 2H minimum when tested according to ASTMD3363.
  14. SurfaceBurning Characteristics:Maximum flamespread index of 25 and maximum smokedeveloped index of 50 according to UL723; certified by an NRTL.
  15. Applied Coating Color:[Standard] [Black] [White].
  16. Reinforcement Shapes and Plates:ASTMA36/A36M, steel plates, shapes, and bars; black and galvanized.
  17. Sealing Requirement:SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Seal ClassA.Seal all seams, joints, connections, and abutments to building.
  18. Penetrations:Seal all penetrations airtight.Cover with escutcheons and gaskets, or fill with suitable compound so there is no exposed insulation.Comply with requirements for escutcheons specified in Section230518 "Escutcheons for HVAC Piping." Provide shaft seals where fan shafts penetrate casing.
  19. Access Doors:Fabricate access doors according to SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure9-15, "Casing Access Doors – 2inch wg (500 Pa)," and Figure9-16, "Casing Access Doors – 3 -10inch wg (750-2500 Pa)"; and according to pressure class of the plenum or casing section in which access doors are to be installed.
  20. Size:[20 by 54 inches (500 by 1370 mm)] <Insert size>.
  21. Vision Panel:Doubleglazed, wire-reinforced safety glass with an airspace between panes and sealed with interior and exterior rubber seals.
  22. Hinges:Piano or butt hinges and latches, number and size according to SMACNA's "HVAC Duct Construction Standards - Metal and Flexible."
  23. Latches:Minimum of two wedgelevertype latches, operable from inside and outside.
  24. Neoprene gaskets around entire perimeters of door frames.
  25. Doors shall open against air pressure.
  26. Condensate Drain Pans:Formed sections of [Type304, stainlesssteel sheet] [G90 (Z275) coated, galvanized sheet steel] complying with requirements in ASHRAE62.1.Pans shall extend a minimum of 12 inches (300 mm) past coil.
  27. Doublewall construction shall have space between walls filled with foam insulation and sealed moisture tight.
  28. Intermediate drain pan or drain trough shall collect condensate from top coil for units with stacked coils or stacked eliminators.
  29. Insulation:Polystyrene or polyurethane.
  30. Slopes shall be in a minimum of two planes to collect condensate from cooling coils (including coil piping connections and return bends), eliminators, and humidifiers when units are operating at maximum catalogued face velocity across cooling coil.
  31. Each drain pan connection shall have a trap.[Drain traps with depth and height differential between inlet and outlet equal or greater to the design static pressure plus 2inch wg (500 Pa.)] Include slab height in trap calculation.

2.2SHOP-FABRICATED CASINGS

  1. Singleand DoubleWall Casings:Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for sheet metal thickness based on indicated staticpressure class unless otherwise indicated.
  2. DoubleWall Casing Inner Panel:Perforated, galvanized sheet steel having 3/32inch (2.4mm) diameter perforations, with overall open area of [23] <Insert number> percent.Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for sheet metal thickness based on indicated staticpressure class unless otherwise indicated.
  3. DoubleWall Casing Inner Panel:Solid sheet steel.Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for sheet metal thickness based on indicated staticpressure class unless otherwise indicated.
  4. Interstitial Insulation:Polyurethane foam complying with NFPA90A or NFPA90B.
  5. Interstitial Insulation:Glass Mineral Wool liner complying with ASTMC1071, NFPA90A, or NFPA90B; and with NAIMAAH124, "Fibrous Glass Duct Liner Standard."
  6. Maximum Thermal Conductivity:[0.27 Btu x in. /h x sq. ft. x degF (0.039W/m xC)] <Insert conductivity> at 75 degF (24 degC) mean temperature.
  7. Coat insulation with antimicrobial coating.
  8. Cover insulation with polyester film complying with UL181, Class1.
  9. Fabricate casings with standing seams and angleiron reinforcements unless otherwise indicated.
  10. Fabricate closeoff sheets from casing to dampers, filter frames, and coils and between stacked coils.Use galvanized sheet steel of same thickness as casing and with a galvanized coating designation of G90 (Z275).
  11. Bolt closeoff sheets to frame flanges and housings.Support coils on stands fabricated from galvanizedsteel angles or channels.
  12. Reinforce casings with galvanized steel angles.

2.3MANUFACTURED CASINGS