SECTION_08_90_00_-_Louvers_and_Vents_R1_0004.pdf

BUREAU OF INDIAN AFFAIRS OGLALA DAM SPILLWAY AND OUTLET WORKS

OGLALA DAM SPILLWAY AND OUTLET WORKS SECTION 08 90 00

JUNE 2023 LOUVERS AND VENTS

FOR BID REV 1 PAGE 1 OF 8

SECTION 08 90 00

LOUVERS AND VENTS

GENERAL

1.01 SCOPE OF WORK

A. This Section specifies the requirements for furnishing and installing louvers and vents.

1.02 REFERENCES

A. American International (ASTM)

ASTM B117 Standard Practice for Operating Salt Spray Apparatus

ASTM B209 Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B221 Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

ASTM D522 Standard Test Methods for Mandrel Bond Test of Attached Approved Organic Coatings

ASTM D523 Standard Test Method for Specular Gloss

ASTM D968 Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive

ASTM D1308 Standard Test Method for Effect of Household Chemicals on Clear and Pigmented Approved Organic Finishes

ASTM D2244 Standard Test Method for Calculation of Color Differences from Instrumentally Measured Color Coordinates

ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity

ASTM D3363 Standard Test Method for Film Hardness by Pencil Test

ASTM D4214 Standard Test Methods for Evaluating Degree of Chalking of Exterior Paint Films

ASTM E488 Standard Test Methods for Strength of Anchors in Concrete Elements

1.03 SUBMITTALS

A. Shop Drawings

Include plans, elevations, sections, details and attachments to other Work. Show blade profiles, angles and spacing.

BUREAU OF INDIAN AFFAIRS SECTION 08 90 00

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Product Data:

a. Submit copies of manufacturer's material specifications, recommended written installation instructions and manufacturer's specifications showing diagrams.

Delegated Design Submittals:

a. For installed louvers and vents indicated to comply with design loads, include structural analysis data signed and sealed by a Registered Professional Engineer who is responsible for their preparation.

B. Quality Control

Comprehensive test reports performed by a qualified testing agency or by manufacturer and witnessed by a qualified testing agency, for each type of louver.

Warranty documents.

1.04 QUALITY ASSURANCE

A. Performance Criteria: Comply with Sheet Metal and Air Conditioning CONTRACTOR's National Association, Architectural Sheet Metal Manual, recommendations for fabrication, construction details, and installation procedures, except as otherwise shown on the Drawings or specified.

B. Component Supply and Compatibility:

Obtain each separate type of louver and vents from a single supplier and from a single manufacturer.

1.05 PRODUCT CONDITIONS

A. Field Measurements: Verify louver openings by field measurements before fabrication and indicate measurements on Shop Drawings.

1.06 WARRANTY

A. Provide written warranty agreeing to replace louver and vent Work which fails in materials or workmanship within three years of the date of Final Acceptance. Failure of materials or workmanship shall include, but is not limited to, excessive leakage or air infiltration, excessive deflections, deterioration of finish or metal in excess of normal weathering, and defects in accessories, weatherstripping, and other components of the Work.

B. Guarantee that the polyvinylidene fluoride based coating meets all criteria specified and will not spall, check, craze, peel or otherwise lose adhesion for a period of twenty years from the date of Final Acceptance to the extent that such shall create unsightly conditions or otherwise impair the intended architectural qualities of the building.

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C. In the event that the polyvinylidene fluoride based coating fails to meet the specified standards, the manufacturer shall, at his own expense, replace or field paint, as directed by the BIA Representative, all areas affected by the failure. In the event that repainting is selected, it shall be done at mutually agreeable intervals throughout the term of the warranty.

D. The warranty does not apply where failure is caused by accidents, or external conditions or forces beyond the control of the manufacturer.

PRODUCTS

2.01 PERFORMANCE REQUIREMENTS

A. Structural Performance: Provide louvers and vents capable of withstanding the effects of gravity loads and wind loads and stresses within limits and under conditions indicated without permanent deformation of louver components, noise or metal fatigue caused by louver blade rattle or flutter, or permanent damage to fasteners and anchors. Wind pressures shall be considered to act on vertical projection of louvers.

B. Seismic Performance: Provide louvers capable of withstanding the effects of earthquake motions determined according to the IBC and ASCE 7, “Minimum Design Loads for Buildings and Other Structures”: Section 9, “Earthquake Loads”.

C. Thermal Movements: Provide louvers that allow for thermal movements resulting from the following maximum change (range) in ambient and surface temperatures by preventing buckling, opening of joints, overstressing of components, failure of connections, and other detrimental effects. Base engineering calculation on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.

Temperature Change (Range): 20°F, ambient; 120°F, material surfaces.

2.02 MATERIALS

A. Aluminum Sheet: ASTM B209, Alloy 5005 with temper as required for forming or as otherwise recommended by the metal producer to provide the required finish.

B. Aluminum Extrusions: ASTM B221, Alloy 6063-T52.

C. Fastenings: Use same material as items fabricated. Provide types, gages and lengths to suit unit installation conditions. Use Phillips flat-head machine screws for exposed fasteners, unless otherwise specified. Use continuous aluminum closure angles on the inside perimeter frame of all louver and vents Work, finished to match louvers and vents.

D. Post-installed Fasteners for Concrete and Masonry: Torque-controlled expansion anchors, made from stainless-steel components, with capability to sustain, without failure, a load equal to four times the loads imposed, for concrete, or six times the loads imposed, for masonry, as determined by testing conforming to ASTM E488, conducted by a qualified independent testing agency.

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2.03 FABRICATION

A. Assemble louvers and vents in factory to minimize field splicing and assembly. Disassemble units as necessary for shipping and handling limitations. Clearly mark units for reassembly and coordinated installation.

B. Vertical Assemblies: Where height of louver and vent units exceeds fabrication and handling limitations, fabricate units to permit field-bolted assembly with close-fitting joints in jambs and mullions, reinforced with splice plates.

Continuous Vertical Assemblies: Fabricate units without interrupting blade-spacing pattern, unless horizontal mullions are shown.

C. Maintain equal louver blade spacing, including separation between blades and frames at head and sill, to produce uniform appearance.

D. Fabricate frames, including integral sills, to fit in openings of sizes as shown, with allowances made for fabrication and installation tolerances, adjoining material tolerances, and perimeter sealant joints.

Frame Type: Channel, unless otherwise shown and as specified.

E. Include supports, anchorages, and accessories required for complete assembly.

F. Provide vertical mullions of type and at spacing shown, but not more than recommended by manufacturer, or 72-inches on centers, whichever is less.

Fully Recessed Mullions: Where shown, provide mullions fully recessed behind louver blades. Where length of louver exceeds fabrication and handling limitations, fabricate with close-fitting blade splices designed to permit expansion and contraction.

Exposed Mullions: Where shown, provide units with exposed mullions of same width and depth as louver frame. Where length of louver exceeds fabrication and handling limitations, provide interlocking split mullions designed to permit expansion and contraction.

G. Where shown, provide subsills made of same material as louvers.

H. Join frame members to each other and to fixed louver blades with fillet welds concealed from view, unless otherwise shown or size of louver assembly makes bolted connections between frame members necessary.

2.04 FIXED, EXTRUDED ALUMINUM LOUVERS

A. Furnish fixed louvers where shown or scheduled. Drainable blades shall incorporate a front lip gutter and recessed second gutter, both of which direct water to jamb and mullion drains.

B. Free Area Velocity: Maximum 960 feet per minute free area velocity at a pressure drop of not more than 0.17-inches water gage carrying less than 0.01 ounces of water per square foot of free area.

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C. All blades shall be 0.081-inch thick. Provide all blades with integral drainage trough along edge of blades. Frame shall be 0.125-inches thick. Mullions shall be of the sliding interlock type.

D. Free Area: Not less than 7.3 square feet for a 48-inch by 48-inch high louver.

E. Provide louver supports designed to carry required wind load.

F. Install gravity backdraft damper and louver screen behind the louver.

G. Products and Manufacturers: Provide one of the following:

No. A4157 by Construction Specialties, Incorporated.

No. K6774 by the Airolite Company.

Approved equal.

2.05 FINISHES

A. Exposed Aluminum Polyvinylidene Fluoride Based Coating: Apply full strength polyvinylidene fluoride based coatings at the factory by coil coating for sheet material and spray coating for extruded material. Provide the following four coat finish system complying with the following:

Alkali clean and hot water rinse all surfaces to receive polyvinylidene fluoride based finish.

Prepare a chemical conversion coating on the surface, using phosphates or chromates followed by a cold water rinse. Seal with a chromic acid rinse and dry, except where manufacturer recommends another method to achieve greater coating reliability.

Apply a base prime coat of epoxy paint to the prepared surface in its coil form, by reverse roller coating. Fully cure in a gas-fired oven to a dry film thickness of 0.2 to 0.4-mils. Follow with a barrier coat, 1.0-mils thick.

Apply color coat containing mica pearlescent or metallic flakes over the barrier coat by roller coating for coil material and airless or Ransburg Elastrostatic Hand Spray for extrusions and fuse at a peak metal temperature of 440°F for a dry film thickness of 0.7-mils for coil coating and 1.2-mils for spray coating so that the total dry film is approximately 1.0-mil thick for coil material and 1.5-mils thick for extruded material.

Apply clear fluoropolymer topcoat to provide a dry film thickness of 0.4 to 0.8-mils.

The entire four coat system shall have a dry film thickness of 2.6- mils, minimum.

Provide the following physical properties, as proven by appropriate and recognized laboratory test methods acceptable to the BIA Representative:

a. Weathering, ASTM D4214: Chalking, not more than No. 8, after exposure for 5,000 hours in Sunshine Arc Weatherometer XWR using 60/60 cycle.

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b. Color Change, ASTM D2244: No greater than 5 N.B.S units after removal of external deposits and after exposure for 5,000 hours in Sunshine Arc Weatherometer XWR using 60/60 cycle.

c. Humidity Resistance, ASTM D2247: No blisters after 3,000 hours.

d. Salt Spray, ASTM B117: Few scattered blisters no larger than ASTM No. 4, and no more than 1/16-inch creep from areas scribed to bare metal after 3,000 hours.

e. Dry Adhesion: No pick-off when tape tested over 1/16-inch cross hatch.

f. Wet Adhesion: No pick-off when tape tested over 1/16-inch cross hatch;

extruded material only.

g. Boiling Water Adhesion: No pick-off when tape tested over cross hatch area after one hour immersion in distilled boiling water.

h. Water Immersion: No pick-off when tape tested over cross hatch area after immersion in aerated distilled water 80±10°F after 500 hours.

i. Abrasion Resistance, ASTM D968: Coefficient of abrasion of 67, minimum.

j. Glass, ASTM D523: 30±5 reflectivity at 60°F.

k. Pencil Hardness, ASTM D3363: HB-H minimum.

l. Dry Film Thickness: Primer, 0.2 to 0.4-mils; barrier coat, 1.0-mils; color coating, 0.7 to 1.5-mils; clear topcoat, 0.4 to 0.8-mils.

m. Solvent Resistance: 100 Double MEK rubs, minimum.

n. Flexibility, ASTM D522: No cracking prior to metal fracture.

o. Acid Resistance, ASTM D1308: 16 hour spot test with five percent hydrochloric acid - no effect.

p. Alkali Resistance, ASTM D1308: 16 hour spot test with five percent sodium hydroxide - no effect.

Provide the Following Colors:

a. Full selection of manufacturer's standard, custom and premium colors for final selection by the BIA Representative.

b. The BIA Representative will select custom special extended life premium colors for louvers and vent Work at time of Shop Drawing and Sample submission review.

Products and Manufacturers: Provide one of the following:

a. Duranar Metallic XL Specialty Color 4-System by PPG Industries Coatings and Resins Division, Incorporated.

b. Approved equal.

B. Anodized Finish

Class I, Color Anodic Finish: AA-M12C22A42/A44 (Mechanical Finish: nonspecular as fabricated; Chemical Finish: Etched, medium matte; Anodic Coating: Architectural Class I, integrally colored or electrolytically deposited color coating 0.018-mm or thicker) complying with AAMA 611.

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a. Color: Light bronze, medium bronze, dark bronze.

2.06 LOUVER SCREENS

A. Provide removable screens for all louvers.

B. Fabricate screen frames of the same metal and finish as the louver units to which secured.

Provide frames consisting of extra heavy duty extruded 0.090-inch aluminum for permanently securing screen mesh. Frames shall be rewireable.

C. Provide insect screen of 18 by 14 mesh, 0.0123-inch diameter stainless steel intercrimp wire. 0.063-inch diameter stainless steel intercrimp wire for all other louvers.

D. Provide bird screen, 1/2-inch square stainless steel wire, 0.063-inch diameter wire.

E. Locate screens on inside face of louvers. Secure screens to louver frames with machine screws, spaced at each corner and at 12-inches on centers.

F. Provide minimum No. 8 stainless steel metal screws, unless larger screws are required by screen size.

G. Provide cross bar screen reinforcement of same material and finish as louver which subdivides screens into maximum area of 50 square feet.

2.07 SILL EXTENSION

A. Gage and Finish: Same as louver.

2.08 ATTACHMENT FRAME

A. Gage and Finish: Same as louver.

B. Size: As shown on the Drawings.

EXECUTION

3.01 INSPECTION

A. CONTRACTOR and his installer must examine the areas and conditions under which louvers and vents Work and associated items are to be installed and notify the BIA Representative, in writing, of conditions detrimental to the proper and timely completion of the Work. Do not proceed with the Work until unsatisfactory conditions have been corrected in a manner acceptable to the BIA Representative.

3.02 PREPARATION

A. Coordinate setting drawings, diagrams, templates, instructions and directions for the

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installation of anchorages which are to be embedded in concrete or masonry construction.

Coordinate the delivery of such items to the Site.

3.03 INSTALLATION

A. Locate and place louver units plumb, level and in proper alignment with adjacent Work.

B. Use stainless steel expansion bolt anchors with stainless steel washers and neoprene gaskets.

Use spring clips at all anchors to stop deflection of the louver frame. Provide anchors spaced 2 feet-0 inches on centers. Provide continuous aluminum angles for anchoring all operable louvers.

C. Form tight joints with exposed connections accurately fitted together. Provide reveals and openings for sealants and joint fillers, as shown.

D. Repair finishes damaged by cutting, welding, soldering and grinding operations required for fitting and jointing. Restore finishes and prime coats of paint so that there is no evidence of corrective Work. Return items which cannot be refinished in the field to the shop, make the required alterations, and refinish the entire unit, or provide new units, as determined by the BIA Representative.

3.04 FIELD QUALITY CONTROL

A. Determine conformity of louver polyvinylidene fluoride finish to these Specifications, as follows:

The manufacturer of the louver and vents shall set aside and label samples of the metal from each production lot for the job. Protect samples from weather.

Make sample louver and vent available at all times, for comparison with installed louver and vent Work as requested by COR, for the full time of the warranty.

Make color comparison measurements with a Hunter Tristimulus Color Difference Meter employing methods of computation in use at the National Bureau of Standards conforming to ASTM D2224.

3.05 ADJUSTMENT AND CLEANING

A. Set adjustable louver blades for uniform alignment in open and closed positions.

B. Adjust louvers so moving parts operate smoothly.

C. Check the motor operator installation for the operable louver.

D. Louvers with dents, warps, gouges or scratches shall be replaced with new louvers, at no additional cost to the AGENCY.

END OF SECTION