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SECTION 08 92 00 – LOUVERED ROOF TOP EQUIPMENT SCREENS
PART 1 - 	GENERAL
1.1	SUMMARY
A.	Section Includes:
1.	Fixed, extruded-aluminum louvered roof top equipment screens
B.	See Division 5 Section "Structural Metal Framing" for structural framing supporting louver sections.
1.2	PERFORMANCE REQUIREMENTS
A.	Design:  Design louvers, including comprehensive engineering analysis by a qualified engineer, using structural performance requirements and design criteria indicated.
B.	Structural Performance:  Louvers shall withstand the effects of gravity loads and the following 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.
1.	Wind Loads:  Determine loads based on a uniform pressure of 30 lb./sq. ft. (1435 Pa), acting inward or outward.
1.3	SUBMITTALS
A.	Product Data:  For each type of product indicated.
B.	Shop Drawings:  For equipment screens and accessories.  Include plans, elevations, sections, details, and attachments to other work.  Show frame profiles and blade profiles, angles, and spacing.
C.	Samples:  For each type of metal finish required.
D.	Submittal:  For louvers indicated to comply with structural performance requirements and design criteria indicated.
PART 2 - 	PRODUCTS
2.1	MATERIALS
A.	Aluminum Extrusions:  ASTM B 221M, Alloy 6063-T5.
B.	Aluminum Sheet:  ASTM B 209M, Alloy 3003 with temper as required for forming.
C.	Fasteners:  Use types and sizes to suit unit installation conditions.
1.	For fastening aluminum, use aluminum or 300 series stainless-steel fasteners.
2.2	FABRICATION, GENERAL
A.	Join concealed frame members to each other and to fixed louver blades with fillet welds concealed from view welds, threaded fasteners, or both, as standard with louver manufacturer unless otherwise indicated or size of louver assembly makes bolted connections between frame members necessary.
2.3	EXTRUDED-ALUMINUM ROOF TOP EQUIPMENT SCREEN
A.	Horizontal Blade Louvered Roof Top Equipment Screen
1.	Basis-of-Design Product:  Architectural Louvers; Model V4YHD. Subject to compliance with requirements, provide the specified product or comparable product by one of the following:
a.	Manufacturers of equivalent products submitted and approved in accordance with Section 01630 - Product Substitution Procedures.
2.	Louver Blade Depth:  4 inches (100 mm) 
3.	Blade Profile:  Sight-proof chevron with blades horizontal.
4.	Blade and Frame Nominal Thickness:  Not less than 0.080 inch (2.03 mm).
5.	Framing Support: Modular aluminum tube framing, finished with clear anodized 204-R1.  Design and construction of framing and connections to handle design wind loads.  Framing to mount directly to air handling unit as shown on drawings.
6.	Hinge: 0.120” thickness aluminum heavy-duty hinge. Each louver panel to be hinged for full access to the air handling unit.
7.	Latch: top and bottom padlock hasp (provided) that accepts 7/16” bolt, standard padlock, or clevis pin as required (by others)
8.	Louver Performance Requirements:
a.	Free Area:  Not less than 5.2 sq. ft. (0.48 sq. m) for 48-inch- (1220-mm-) wide by 48-inch- (1220-mm-) high louver assembly.
b.	Horizontal Drag Coefficient: Not greater than 0.81 on a cross sectional profile, allowing for a 19% reduction in wind load imposed horizontally upon supporting structural framing.
2.4	ALUMINUM FINISHES
A.	High-Performance Organic Finish: 3-coat fluoropolymer finish complying with AAMA 2605 and containing not less than 70 percent PVDF resin by weight in color coat.  Prepare, pre-treat, and apply coating to exposed metal surfaces to comply with coating and resin manufacturers' written instructions.
1.	Color and Gloss: As selected by Architect from manufacturer's full range.
PART 3 - 	EXECUTION
3.1	INSTALLATION
A.	Locate and place equipment screens level, plumb, and at indicated alignment with adjacent work.
B.	Use concealed anchorages where possible.  Provide brass or lead washers fitted to screws where required to protect metal surfaces and to make a weather-tight connection.
C.	Provide perimeter reveals and openings of uniform width to allow for thermal expansion, as indicated.
D.	Repair damaged finishes so no evidence remains of corrective work.  Return items that cannot be refinished in the field to the factory and refinish entire unit or provide new units.
END OF SECTION 08 92 00