Final 23 30 00 Air Distribution.pdf

OFFUTT AIR FORCE BASE

(092036) 23 30 00-1 (Repair AHU O-Club, B462)

2010 by FEI

SECTION 23 30 00

AIR DISTRIBUTION

PART 1 - GENERAL

1.1 WORK INCLUDED

A. Extent of air distribution work required by this section is indicated on drawings and schedules and by requirements of this section.

B. Types of air distribution work specified in this section include the following:

1. Air filters and gages:

a. Replaceable (Throwaway).

b. Filter gages.

2. Metal Ductwork:

a. Flexible Duct.

3. Ductwork Accessories:

a. Manual dampers.

b. Fire dampers.

c. Turning vanes.

d. Flexible connections.

4. Air outlets and inlets:

a. Diffusers, registers and grilles.

5. Air Flow Measuring Station.

C. Duct mounted smoke detector installation is included as work of this section.

1.2 QUALITY ASSURANCE

A. Manufacturer's Qualifications: Firms regularly engaged in manufacture of air distribution products of types, materials and sizes required, whose products have been in satisfactory use in similar service for not less than five (5) years.

B. Installer's Qualifications: Firm with at least three (3) years of successful installation experience on projects with air distribution systems similar to that required for Project.

C. Codes and Standards:

1. SMACNA Standards: Comply with SMACNA "HVAC Duct Construction Standards, Metal and

Flexible" 1995 2 nd

Edition for fabrication and installation of metal ductwork.

2. NFPA Compliance: Comply with NFPA 90A "Standard for the Installation of Air Conditioning and Ventilating Systems" and NFPA 96 "Standard for Ventilation Control and Fire Protections

(092036) 23 30 00-2 (Repair AHU O-Club, B462) of Commercial Cooking Operations", NFPA 90B "Standard for the Installation of Warm Air

Heating and Air Conditioning Systems".

3. UL Compliance: Construct, test, and label fire dampers in accordance with UL Standard 555

"Fire Dampers and Ceiling Dampers".

4. AMCA Compliance: Test and rate louvers in accordance with AMCA 500 "Test Method for

Louvers, Dampers and Shutters".

5. AMCA Seal: Provide louvers bearing AMCA Certified Rating Seal.

6. ARI Compliance: Provide air terminals which have been tested and rated in accordance with

ARI 880 "Industry Standard for Air Terminals" and bear ARI certification seal.

7. ASTM C 1071: Duct liner shall comply with ASTM C 1071.

8. ASHRAE Compliance: Comply with provisions of ASHRAE Standard 52 for method of testing and rating air filter units.

1.3 SUBMITTALS

A. Product data: Submit manufacturer's technical product data on air distribution products listed, including performance data for air flow pressure drops through filters, noise criteria, air inlet, outlet and terminal room schedules, material construction and installation instructions.

1. Fire Dampers.

2. Diffusers, registers and grilles.

3. Air flow measuring stations.

B. Shop drawings: Submit scaled layout drawings of metal ductwork and fittings including, but not limited to duct sizes, locations, elevations, and slopes of horizontal runs, wall and floor penetrations, and connections. Show interface and spatial relationship between ductwork and proximate equipment.

Show modifications of indicated requirements, made to conform to local shop practice, and how those modifications ensure that free area, materials and rigidity are not reduced.

C. Maintenance Data: Submit maintenance data and spare parts lists, cleaning and trouble shooting instructions. Include this data, product data and shop drawings in Maintenance Manual.

D. Record Drawings: At project closeout, submit record drawings of installed ductwork, duct accessories and air outlets and inlets.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Manufacturer: Subject to compliance with requirements, provide air distribution equipment of one (1) of the following:

1. Air Filters

a. American Air Filter Co.

b. Camfil Farr

c. Continental Air Filters

d. Eco-Air Products, Inc.

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2. Filter Gages

a. Camfil Farr

b. Dwyer Instruments, Inc.

3. Fire Dampers

a. Air Balance, Inc.

b. Ruskin

4. Round Spiral Ductwork and Fittings:

a. Lindab, Inc.

b. Norlock.

c. Sheet Metal Connectors, Inc.

d. United McGill.

e. Wesco.

f. Wichita Sheet Metal.

5. Diffusers, Registers and Grilles:

a. Reference schedule on drawings.

6. Air Flow Measuring Station:

a. Paragon Controls Inc.

b. Approved equal.

2.2 AIR FILTERS AND GAGES

A. Replaceable (Throwaway) Panel Filters: Provide factory-fabricated, viscous-coated, flat panel type replaceable air filters with 2-inch thick UL 60% efficiency, MERV 11 throwaway media material;

construct media of interlaced glass fibers, spray with non-flammable adhesive, frame in throwaway fiberboard casings, and sandwich between perforated metal grills.

B. Provide manometer-type filter gage for each filter bank, with logarithmic curve tube gage, with integral leveling gage, graduated to read from 0- to 3-inch w.g.

1. Provide pressure tips, tubing, gage connections and mounting bracket.

2.3 METAL DUCTWORK

A. Materials:

1. Exposed Ductwork Materials: Where ductwork is indicated to be exposed to view in occupied spaces, provide materials which are free from visual imperfections including pitting, seam marks, roller marks, oil canning, stains and discolorations and other imperfections, including those which would impair painting.

2. Sheet Metal, General: Provide sheet metal in thicknesses indicated, packaged and marked as specified in ASTM A 700.

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3. Galvanized Sheet Steel: Lock-forming quality, ASTM A 653, Coating Designation G 90.

Provide mill phosphatized finish for exposed surfaces of ducts exposed to view.

4. Reinforcement Shapes and Plates: Unless otherwise indicated, provide galvanized-steel reinforcing where installed on galvanized sheet metal ducts.

5. Tie Rods: Galvanized-steel, 1/4-inch minimum diameter for 36-inch length or less; 3/8-inch minimum diameter for lengths longer than 36-inches.

B. Miscellaneous Materials:

1. Fittings: Provide radius type fittings fabricated of multiple sections with maximum 15 degree change of direction per section. Unless specifically detailed otherwise, use 45 degree laterals and 45 degree elbows for branch takeoff connections. Where 90 degree branches are indicated, provide conical type tees.

2. Joint and Seam Sealant: Indoor/Outdoor Water Based Duct Sealant shall be all purpose duct sealant for use on all types of metal duct, glass fiber duct board, and flex duct, as well as duct fabric and flexible tubing runouts. The sealant incorporates a built-in fiber reinforcement for exceptional strength, with UV inhibitors for outdoor use. UL 181A-M Listed / UL 181B-M

Listed. Provide Versa-Grip 181 Hardcast or approved equal.

3. Flanged Joint Mastics: One-part, acid-curing, silicone elastomeric joint sealants, complying with ASTM C 920, Type S, Grade NS, Class 25, Use O.

4. Fire Resistant Sealant: Provide one-part elastomeric sealant formulated for use in a through-penetration fire-stop system for filling openings around duct penetrations through walls and floors, having fire-resistance ratings indicated as established by testing identical assemblies per ASTM E 814 by Underwriters Laboratory, Inc. or other testing and inspecting agency acceptable to authorities having jurisdiction.

5. Ductwork Support Materials: Except as otherwise indicated, provide hot-dipped galvanized-steel fasteners, anchors, rods, straps, wire rope, trim and angles for support of ductwork.

Hang all ductwork from the structure only. Do not hang from metal deck.

6. Flexible Duct: Factory pre-insulated duct composed of a corrosion-resistant reinforcing, corrugated aluminum then covered with 1-1/2-inch, 3/4 lb. density fiberglass insulation blanket sheathed in a vapor barrier of aluminum metalized polyester film laminated to glass mesh, elastomer back-coated. The duct must comply with the latest NFPA Standard 90A and be listed as a Class 1 Air Duct Material, UL Standard 181. Flexible duct of coated spring or rigid wire is not permitted.

C. Fabrication:

1. General: Except as otherwise indicated, fabricate rectangular ducts with galvanized sheet steel, in accordance with SMACNA "HVAC Duct Construction Standards," Tables 1-3 through

1-16 and 1-21 through 1-25, including their associated details. Conform to the requirements in the referenced standard for metal thickness, reinforcing types and intervals, tie rod applications and joint types and intervals.

2. Fabricate rectangular ducts in lengths appropriate to reinforcement and rigidity class required for pressure classification.

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3. Static Pressure Classifications: Except where otherwise indicated, construct duct systems to the following pressure classifications:

a. Supply Ducts: 4-inch water gage pressure class, except for ducts upstream from variable air volume boxes.

b. Return Ducts: 3-inch water gage, negative pressure.

4. Provide materials that are free from visual imperfections such as pitting, seam marks, roller marks, stains and discolorations.

5. Crossbreaking or Cross Beading: Crossbreak or bead duct sides that are 19-inches and larger and are 20-gage or less, with more than 10 square feet of unbraced panel area, as indicated in

SMACNA "HVAC Duct Construction Standard," Figure 1-4, unless they are lined or are externally insulated.

6. Rectangular Duct Fittings: Fabricate elbows, transitions, offsets, branch connections, and other duct construction in accordance with SMACNA "HVAC Metal Duct Construction

Standard," 1995 Edition, Figures 2-1 through 2-8.

7. Ductmate Fittings: Joints constructed in accordance with SMACNA Standards that use four

(4) corner connections shall be equal to products manufactured by Ductmate Industries Inc., Ward Industries Inc. or an approved equal. Refer to manufacturer's guidelines.

8. Double Wall Round Duct and Fitting for Return Air, FACTORY FABRICATED

a. Round Spiral lockseam with standing ribs (McGill, UNI-RIB) Ducts: Fabricate supply ducts of according to SMACNA's "HVAC Duct Construction Standards--Metal and

Flexible."

(1) Manufacturers or approved equal:

(a) McGill AirFlow Corporation.

(b) SEMCO Incorporated.

b. Return air ducts (On Roof)

(1) McGill K-27 double wall insulated (or approved equivalent)

(2) Aluminum inside and outside.

(3) Double wall slip joints

c. Fittings:

(1) Fabricate to comply with SMACNA's "HVAC Duct Construction Standards--

Metal and Flexible," with metal thicknesses specified for longitudinal-seam straight ducts.

(2) Fabricate elbows to 12 inches die-formed (smooth). Bend radius shall be 1-

1/2 times duct diameter.

(3) Fabricate elbows from 12 inches gored (5 gore). Bend radius shall be 1-1/2 times duct diameter.

(4) Fabricated conical tees and reducers.

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(5) The installation of the spiral duct connector shall be in accordance with the manufacturer's printed instruction and installation manuals.

(6) The spiral duct connector consists of the following components:

(a) Two (2) mating round duct connector flanges with an integral sealant.

(b) A gasket between the two (2) mating flanges.

(c) A roll-formed closure ring that is drawn tight with a bolt and nut.

d. Round Exposed Ductwork: Construct of galvanized sheet steel complying with ASTM

A 527 by the following methods and in minimum gages listed:

DIAMETER MINIMUM GAGE METHOD OF MANUFACTURE

3-inch to 14-inch 26 Spiral Lockseam

15-inch to 26-inch 24 Spiral Lockseam

27-inch to 36-inch 22 Spiral Lockseam

37-inch to 50-inch 20 Spiral Lockseam

51-inch to 60-inch 18 Spiral Lockseam

Over 60-inch 16 Longitudinal Seam

2. The installation of the spiral duct connector shall be in accordance with the manufacturer's printed instruction and installation manuals.

3. The spiral duct connector consists of the following components:

a. Two (2) mating round duct connector flanges with an integral sealant.

b. A gasket between the two (2) mating flanges.

c. A roll-formed closure ring that is drawn tight with a bolt and nut.

4. Double Wall Rectangular Duct and Fitting for Supply Air, FACTORY FABRICATED

a. Fabricate supply ducts of according to SMACNA's "HVAC Duct Construction

Standards--Metal and Flexible."

b. Manufacturers or approved equal:

(1) McGill AirFlow Corporation.

(2) SEMCO Incorporated.

c. Supply air ducts

(1) McGill K-27 double wall insulated (or approved equivalent)

(2) Galvanized steel outside inside and perforated galvanized steel inside

(3) Minimum 1-inch insulation between.

2.4 DUCTWORK ACCESSORIES

A. Low Pressure Manual Dampers: Provide dampers of single blade type or multiblade type, constructed in accordance with SMACNA "Low Pressure Duct Standards".

B. Fire Dampers: Provide fire dampers, of types and sizes indicated. Fire Dampers shall be dynamic type and shall be constructed and tested in accordance with UL Safety Standard 555. Fire dampers used

(092036) 23 30 00-7 (Repair AHU O-Club, B462) for the protection of openings in walls, partitions or floors with fire resistance ratings of less than three

(3) hours shall have 1-1/2 hour fire protection rating. Fire dampers used for the protection of openings in walls, partitions or floors having a fire resistance rating of three (3) hours or more, shall have a three

(3) hour fire protection rating. Provide fusible link rated at 165 o F unless otherwise indicated. Fire dampers shall be equipped for vertical or horizontal installation as required by the location shown. Fire dampers shall be installed in wall and floor openings utilizing steel sleeves, angles, other materials and practices required to provide an installation equivalent to that utilized by the manufacturer when dampers were tested at UL. Fire dampers shall include UL label. Each dynamic fire damper shall include a steel sleeve and retaining angles furnished by the damper manufacturer to ensure appropriate installation. Submittal information shall include the fire protection rating, maximum velocity/pressure ratings and the manufacturer's UL installation instructions. Each fire damper shipment shall include the same UL installation instructions. The dampers shall be installed in accordance with these instructions.

C. Manufactured Turning Vanes: Provide turning vanes constructed of 1-1/2-inch wide curved blades set at 3/4-inch o.c., supported with bars perpendicular to blades set at 2-inch o.c. and set into side strips suitable for mounting in ductwork. As an option, use Ductmate Prorail, Turning Vane and rail system.

D. Flexible Duct Connections: Provide flexible duct connections wherever ductwork connects to vibration isolated equipment. Construct flexible connections of neoprene-coated flameproof fabric crimped into duct flanges for attachment to duct and equipment. Make airtight joint. Provide adequate joint flexibility to allow for thermal, axial, transverse, and torsional movement and also capable of absorbing vibrations of connected equipment.

E. Connectors shall comply with NFPA 90A, "Installation of Air Conditioning and Ventilation Systems" and

NFPA 90B, "Installation of Warm Air Heating and Air Conditioning Systems".

1. Indoor installations shall be of a UL 214 Listed, fire-retardant vinyl coated woven nylon or

Neoprene coated woven fiberglass fabric. Minimum density of vinyl is 22 ounces/sq. yd. and rated to 180F. Minimum density of Neoprene 30 ounces/sq. yd and rated to 200F.

2. Outdoor installations shall be of a UL 214 Listed UV-resistant Hypalon coated woven fiberglass fabric. Minimum density 24 ounces/sq. yd. and rated to 250F.

3. High Temperature Applications shall be a UL 214 Listed, silicone coated satin weave fiberglass fabric. Minimum density 17.5 ounces/sq. yd. and rated to 500F.

4. Chemical Resistant Applications shall be of Teflon coated woven fiberglass fabric. Minimum density 18 ounces/sq. yd. and rated to 500F.

5. Connector shall be Ductmate Proflex or approved equal.

F. Duct Damper Access: Where duct balancing dampers are above inaccessible ceilings, provide "Young

Regulator" or equal damper extension rods and access panel assemblies in ceilings with flush accessible cover.

G. Provide access doors of adequate size to allow easy access to the equipment that will require maintenance. Provide insulated or acoustical line doors where duct is of the same construction.

H. Systems designed for 3-inch w.g. and less (SMACNA Seal Class B or C) shall utilize hinged, cam or hinged and cam square-framed access door.

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I. Systems designed for 4-inch w.g. and above (SMACNA Seal Class A) shall utilize sandwich-type access door. Construct doors in accordance with Figure 2-10 of the 1995 SMACNA Manual, "HVAC

Duct Construction Standards, Metals and Flexible" Second Edition.

J. Manufacturer to provide an installed neoprene gasket around perimeter of access door for airtight seal.

2.5 AIR OUTLETS AND INLETS

A. Diffusers, Registers, and Grilles:

1. General: Except as otherwise indicated, provide manufacturer's standard air diffusers, registers and grilles where shown; of size, shape, capacity and type indicated; constructed of materials and components as indicated, and as required for complete installation.

2. Performance: Provide air diffusers, registers, and grilles that have, as minimum, temperature and velocity traverses, throw and drop, and noise criteria ratings for each size device as listed in manufacturer's current data.

3. Ceiling and Wall Compatibility: Provide diffusers, registers, and grilles with border styles that are compatible with adjacent ceiling systems, and that are specifically manufactured to fit into ceiling module with accurate fit and adequate support. Refer to general construction drawings and specifications for types of ceiling and wall systems which will contain each type of air diffuser, register and grille.

4. Finish: Diffusers, registers and grilles shall have a white factory applied finish, unless shown otherwise.

5. Dampers and Accessories: See schedule on drawings for required dampers and accessories.

6. Types: Unless designated herein, provide diffusers, registers, and grilles of type, capacity and with accessories and finishes as listed on schedules and details, shown on drawings.

2.7 AIRFLOW MEASURING STATION

A. Multiple element pitot-tube type differential pressure output signal element. Complete with Type 316

Stainless Steel sensors, single port “high side” connector and multi-port “low side” connectors in 8-inch deep 16 gauge galvanized sheetmetal casing. Plastic tubing and barbed fitting to single point connections.

B. Shipped with a standalone differential pressure transducer 24 VAC/VDC input, 4 to 20 MA output, auto zeroing, digital display for remote mounting.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine areas and conditions under which air distribution systems will be installed. Do not proceed with work until unsatisfactory conditions have been corrected in a manner acceptable to Installer.

3.2 INSTALLATION OF AIR FILTERS

A. Locate each filter unit accurately in position indicated, in relation to other work. Position unit with sufficient clearance for normal service and maintenance.

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B. Install air filter gage pressure tips upstream and downstream of filters to indicate air pressure drop through air filter. Mount filter gages on outside of filter housing or filter plenum, in accessible position.

Adjust and level inclined gages if any, for proper readings.

3.3 INSTALLATION OF METAL DUCTWORK

A. General: Assemble and install ductwork in accordance with recognized industry practices which will achieve air tight (5% leakage for systems rated 3-inches and under; 1% for systems rated over 3-inches) and noiseless (no objectionable noise) systems, capable of performing each indicated service.

Install each run with minimum number of joints. Align ductwork accurately at connections, within 1/8-inch misalignment tolerance and with internal surfaces smooth. Support ducts rigidly with suitable ties, braces, hangers and anchors of type which will hold ducts true-to-shape and to prevent buckling.

Support vertical ducts at every floor. Comply with all SMACNA HVAC Duct Construction Standards.

B. The Contractor shall form and erect all ductwork to avoid joists, beams, pipes, light fixtures, etc., and shall maintain fixed ceiling heights and clearances. Provide all drops, raises or offsets in ductwork as required by conditions at building.

C. All openings for ductwork in new and existing construction shall be provided by the General Contractor;

however, it shall be this Contractor's responsibility to properly layout and locate all openings required for the installation of these items. All patching and refinishing shall be done in a manner satisfactory to the

Architect.

D. Sealing of Rectangular Ductwork: All transverse joints and longitudinal seams shall conform to

SMACNA's Class A sealing requirements as defined on Page 1-8, of the 1995 SMACNA Manual, Second Edition.

E. Flexible Ducts: Maximum installed length (from diffuser or grille to sheet metal ductwork), shall be 6-feet-0-inches.

F. Penetrations: Where ducts pass through interior partitions and exterior walls, conceal space between construction opening and duct or duct insulation with sheet metal flanges of same gage as duct.

Overlap opening on four (4) sides by at least 1-1/2-inch. Fasten duct and substrate.

1. Where ducts pass through fire-rated floors, walls or partitions, provide firestopping between duct and substrate.

3.4 INSTALLATION OF DUCTWORK ACCESSORIES

A. Install ductwork accessories in accordance with manufacturer's installation instructions, with applicable portions of details of construction as shown in SMACNA Standards and in accordance with recognized industry practices to ensure that products serve intended function.

B. At each branch takeoff of supply, return and exhaust systems provide manual volume damper. Provide additional dampers where indicated on drawings. Dampers shall be at least one (1) gage heavier than ducts in which installed, have stiffened edges, shall operate freely and not rattle in any position. Each damper shall have accessible indicating locking quadrant. For concealed quadrants provide 6-inch diameter hand access opening with cover plate flush with finish surface.

C. Install turning vanes in square or rectangular 90 degree elbows in supply and exhaust air systems, and elsewhere as indicated.

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D. Install fire and smoke dampers according to the manufacturer's UL Approved printed instructions.

Install access door in ductwork per UL and NFPA requirements. Provide approved ductwork access doors on one (1) side of wall.

E. Install fusible links in fire dampers.

3.5 SEAM AND JOINT SEALING

A. General: Seal duct seams and joints as follows:

B. Pressure Classifications Greater Than 3-Inch Water Gage: All transverse joints, longitudinal seams, and duct penetrations.

C. Pressure Classification 2 and 3-Inch Water Gage: All transverse joints and longitudinal seams.

D. Pressure Classification Less than 2-Inch Water Gage: Transverse joints only.

E. Seal externally insulated ducts prior to insulation installation.

3.6 CONNECTIONS

A. Equipment Connections: Connect equipment with flexible connectors in accordance with manufacturer's recommendations.

B. Branch Connections: Comply with SMACNA "HVAC Duct Construction Standards," Figures 2-5 and 2-

6.

C. Outlet and Inlet Connections: Comply with SMACNA "HVAC Duct Construction Standards," Figures 2-

14 through 2-16.

D. Terminal Units Connections: Comply with SMACNA "HVAC Duct Construction Standards," Figure 2-

17.

3.7 INSTALLATION OF AIR OUTLETS AND INLETS

A. General: Install air outlets and inlets in accordance with manufacturer's written instructions and in accordance with recognized industry practices to insure that products serve intended functions.

B. Locate diffusers, registers and grilles in center of acoustical ceiling modules.

C. Repair all marred surfaces with manufacturer's touch-up paint.

3.8 INSTALLATION OF DUCT MOUNTED SMOKE DETECTORS

A. Detectors shall be furnished and wired by Electrical Contractor. HVAC Contractor shall install the detectors in the metal ductwork maintaining accessibility of the detectors for cleaning and service.

Installation shall comply with manufacturer's recommendations.

3.9 CLEANING

A. Clean ductwork internally, unit-by-unit as it is installed, of dust and debris.

B. Clean external surfaces of foreign substances that might cause corrosion, deterioration of the metal or where ductwork is to be painted.

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C. Interior surfaces shall be free of dust and debris prior to initial start up.

END OF SECTION