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36C24419B0044 Attachment 19 - 23 31 00 HVAC Ducts.docx
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03-01-13
SECTION 23 31 00
HVAC DUCTS AND CASINGS
PART 1 GENERAL
1.1 DESCRIPTION
| A. | Ductwork and accessories for HVAC including the following: |
| 1. | Supply air, return air, outside air, exhaust, make-up air, and relief systems. |
| B. | Definitions: |
| 1. | SMACNA Standards as used in this specification means the HVAC Duct Construction Standards, Metal and Flexible. |
| 2. | Seal or Sealing: Use of liquid or mastic sealant, with or without compatible tape overlay, or gasketing of flanged joints, to keep air leakage at duct joints, seams and connections to an acceptable minimum. |
| 3. | Duct Pressure Classification: SMACNA HVAC Duct Construction Standards, Metal and Flexible. |
1.2 QUALITY ASSURANCE
| A. | Duct System Construction and Installation: Referenced SMACNA Standards are the minimum acceptable quality. |
| D. | Duct Sealing, Air Leakage Criteria, and Air Leakage Tests: Ducts shall be sealed as per duct sealing requirements of SMACNA HVAC Air Duct Leakage Test Manual for duct pressure classes shown on the drawings. |
| E. | Duct accessories exposed to the air stream, such as dampers of all types (except smoke dampers) and access openings, shall be of the same material as the duct or provide at least the same level of corrosion resistance. |
1.3 APPLICABLE PUBLICATIONS
| A. | The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only. |
| B. | American Society of Civil Engineers (ASCE): |
| ASCE7-05 | Minimum Design Loads for Buildings and Other Structures |
| C. | American Society for Testing and Materials (ASTM): |
| A16799(2009) | Standard Specification for Stainless and HeatResisting ChromiumNickel Steel Plate, Sheet, and Strip |
| A653-09 | Standard Specification for Steel Sheet, ZincCoated (Galvanized) or Zinc-Iron Alloy coated (Galvannealed) by the Hot-Dip process |
| A1011-09a | Standard Specification for Steel, Sheet and Strip, Hot rolled, Carbon, structural, High-Strength Low-Alloy, High Strength Low-Alloy with Improved Formability, and Ultra-High Strength |
| B20907 | Standard Specification for Aluminum and AluminumAlloy Sheet and Plate |
| C1071-05e1 | Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material) |
| E84-09a | Standard Test Method for Surface Burning Characteristics of Building Materials |
| D. | National Fire Protection Association (NFPA): |
| 90A-09 | Standard for the Installation of Air Conditioning and Ventilating Systems |
| 96-08 | Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations |
| E. | Sheet Metal and Air Conditioning Contractors National Association (SMACNA): |
| 2nd Edition – 2005 | HVAC Duct Construction Standards, Metal and Flexible |
| 1st Edition - 1985 | HVAC Air Duct Leakage Test Manual |
| 6th Edition – 2003 | Fibrous Glass Duct Construction Standards |
| F. | Underwriters Laboratories, Inc. (UL): |
| 18108 | FactoryMade Air Ducts and Air Connectors |
| 55506 | Standard for Fire Dampers |
| 555S06 | Standard for Smoke Dampers |
PART 2 PRODUCTS
2.1 DUCT MATERIALS AND SEALANTS
| A. | General: Except for systems specified otherwise, construct ducts, casings, and accessories of galvanized sheet steel, ASTM A653, coating G90; or, aluminum sheet, ASTM B209, alloy 1100, 3003 or 5052. |
| B. | Specified Corrosion Resistant Systems: Stainless steel sheet, ASTM A167, Class 302 or 304, Condition A (annealed) Finish No. 4 for exposed ducts and Finish No. 2B for concealed duct or ducts located in mechanical rooms. |
| C. | Joint Sealing: Refer to SMACNA HVAC Duct Construction Standards, paragraph S1.9. |
| 1. | Sealant: Elastomeric compound, gun or brush grade, maximum 25 flame spread and 50 smoke developed (dry state) compounded specifically for sealing ductwork as recommended by the manufacturer. Generally provide liquid sealant, with or without compatible tape, for low clearance slip joints and heavy, permanently elastic, mastic type where clearances are larger. Oil base caulking and glazing compounds are not acceptable because they do not retain elasticity and bond. |
| 2. | Tape: Use only tape specifically designated by the sealant manufacturer and apply only over wet sealant. Pressure sensitive tape shall not be used on bare metal or on dry sealant. |
| 3. | Gaskets in Flanged Joints: Soft neoprene. |
| E. | Approved factory made joints may be used. |
2.2 DUCT CONSTRUCTION AND INSTALLATION
| A. | Regardless of the pressure classifications outlined in the SMACNA Standards, fabricate and seal the ductwork in accordance with the following pressure classifications: |
| B. | Duct Pressure Classification: |
| 0 to 50 mm (2 inch) |
> 50 mm to 75 mm (2 inch to 3 inch) > 75 mm to 100 mm (3 inch to 4 inch) Show pressure classifications on the floor plans.
| C. | Seal Class: All ductwork shall receive Class A Seal |
| D. | Duct Hangers and Supports: Refer to SMACNA Standards Section IV. Avoid use of trapeze hangers for round duct. |
2.3 FLEXIBLE AIR DUCT
| A. | General: Factory fabricated, complying with NFPA 90A for connectors not passing through floors of buildings. Flexible ducts shall not penetrate any fire or smoke barrier which is required to have a fire resistance rating of one hour or more. Flexible duct length shall not exceed 1.5 m (5 feet). Provide insulated acoustical air duct connectors in supply air duct systems and elsewhere as shown. |
| B. | Flexible ducts shall be listed by Underwriters Laboratories, Inc., complying with UL 181. Ducts larger than 200 mm (8 inches) in diameter shall be Class 1. Ducts 200 mm (8 inches) in diameter and smaller may be Class 1 or Class 2. |
| C. | Insulated Flexible Air Duct: Factory made including mineral fiber insulation with maximum C factor of 0.25 at 24 degrees C (75 degrees F) mean temperature, encased with a low permeability moisture barrier outer jacket, having a puncture resistance of not less than 50 Beach Units. Acoustic insertion loss shall not be less than 3 dB per 300 mm (foot) of straight duct, at 500 Hz, based on 150 mm (6 inch) duct, of 750 m/min (2500 fpm). |
| D. | Application Criteria: |
| 1. | Temperature range: -18 to 93 degrees C (0 to 200 degrees F) internal. |
| 2. | Maximum working velocity: 1200 m/min (4000 feet per minute). |
| 3. | Minimum working pressure, inches of water gage: 2500 Pa (10 inches) positive, 500 Pa (2 inches) negative. |
| E. | Duct Clamps: 100 percent nylon strap, 80 kg (175 pounds) minimum loop tensile strength manufactured for this purpose or stainless steel strap with cadmium plated worm gear tightening device. Apply clamps with sealant and as approved for UL 181, Class 1 installation. |
part 3 - execution
3.1 INSTALLATION
| A. | Fabricate and install ductwork and accessories in accordance with referenced SMACNA Standards: |
| 1. | Drawings show the general layout of ductwork and accessories but do not show all required fittings and offsets that may be necessary to connect ducts to equipment, boxes, diffusers, grilles, etc., and to coordinate with other trades. Fabricate ductwork based on field measurements. Provide all necessary fittings and offsets at no additional cost to the government. Coordinate with other trades for space available and relative location of HVAC equipment and accessories on ceiling grid. Duct sizes on the drawings are inside dimensions which shall be altered by Contractor to other dimensions with the same air handling characteristics where necessary to avoid interferences and clearance difficulties. |
| 2. | Provide duct transitions, offsets and connections to dampers, coils, and other equipment in accordance with SMACNA Standards, Section II. Provide streamliner, when an obstruction cannot be avoided and must be taken in by a duct. Repair galvanized areas with galvanizing repair compound. |
| 3. | Provide bolted construction and tierod reinforcement in accordance with SMACNA Standards. |
| 4. | Construct casings, eliminators, and pipe penetrations in accordance with SMACNA Standards, Chapter 6. Design casing access doors to swing against air pressure so that pressure helps to maintain a tight seal. |
| C. | Install duct hangers and supports in accordance with SMACNA Standards, Chapter 4. |
| D. | Flexible duct installation: Refer to SMACNA Standards, Chapter 3. Ducts shall be continuous, single pieces not over 1.5 m (5 feet) long (NFPA 90A), as straight and short as feasible, adequately supported. Centerline radius of bends shall be not less than two duct diameters. Make connections with clamps as recommended by SMACNA. Clamp per SMACNA with one clamp on the core duct and one on the insulation jacket. Flexible ducts shall not penetrate floors, or any chase or partition designated as a fire or smoke barrier, including corridor partitions fire rated one hour or two hour. Support ducts SMACNA Standards. |
| E. | Protection and Cleaning: Adequately protect equipment and materials against physical damage. Place equipment in first class operating condition, or return to source of supply for repair or replacement, as determined by Resident Engineer. Protect equipment and ducts during construction against entry of foreign matter to the inside and clean both inside and outside before operation and painting. When new ducts are connected to existing ductwork, clean both new and existing ductwork by mopping and vacuum cleaning inside and outside before operation. |
E N D 23 31 00 - 1
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