Q&A_Attachment_Question__03.pdf

NORTH CAROLINA AIR NATIONAL GUARD – 145TH WING 21 OCTOBER 2016

SQUAD OPERATIONS REPLACEMENT FACILITY

CHARLOTTE-DOUGLAS ANG BASE – CHARLOTTE, NC FINAL B-3 SUBMITTAL

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SECTION 11 52 13 - PROJECTION SCREENS

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Electrically operated, front-projection screens and controls.

1.2 DEFINITIONS

A. Gain: Ratio of light reflected from screen material to that reflected perpendicularly from a magnesium carbonate surface as determined per SMPTE RP 94.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: Show layouts and types of front-projection screens. Include the following:

1. Drop lengths.

2. Location of seams in viewing surfaces.

3. Location of screen centerline relative to ends of screen case.

4. Anchorage details, including connection to supporting structure for suspended units.

5. Details of juncture of exposed surfaces with adjacent finishes.

6. Location of wiring connections for electrically operated units.

7. Wiring diagrams for electrically operated units.

8. Accessories.

C. Samples for Initial Selection: For finishes of surface-mounted screen cases.

1.4 CLOSEOUT SUBMITTALS

A. Maintenance Data: For front-projection screens to include in maintenance manuals.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Environmental Limitations: Do not deliver or install front-projection screens until spaces are enclosed and weathertight, wet work in spaces is complete and dry, and temporary HVAC system is operating and maintaining ambient temperature and humidity conditions at occupancy levels during the remainder of the construction period.

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1.6 COORDINATION

A. Coordinate layout and installation of front-projection screens with adjacent construction, including ceiling suspension systems, light fixtures, HVAC equipment, fire-suppression system, audio and visual control devices, and partitions.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Source Limitations for Projection Screens: Obtain front-projection screens from single manufacturer. Obtain accessories, including necessary mounting hardware, from screen manufacturer.

2.2 ELECTRICALLY OPERATED, FRONT-PROJECTION SCREENS

A. General: Manufacturer's standard units consisting of case, screen, motor, controls, mounting accessories, and other components necessary for a complete installation. Provide units that are listed and labeled as an assembly by UL or another testing and inspecting agency acceptable to authorities having jurisdiction.

1. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

2. Controls: Remote, three-position control switch installed in recessed device box with flush cover plate matching other electrical device cover plates in room where switch is installed.

a. Provide power supply for low-voltage systems if required.

3. Motor in Roller: Instant-reversing motor of size and capacity recommended by screen manufacturer; with permanently lubricated ball bearings, automatic thermal-overload protection, preset limit switches to automatically stop screen in up and down positions, and positive-stop action to prevent coasting. Mount motor inside roller with vibration isolators to reduce noise transmission.

4. Screen Mounting: Top edge securely anchored to rigid metal roller and bottom edge formed into a pocket holding a 3/8-inch-diameter metal rod with ends of rod protected by plastic caps.

a. Roller for motor in roller is supported by vibration- and noise-absorbing supports.

5. Tab Tensioning: Provide units that have a durable low-stretch cord, such as braided polyester, on each side of screen that is connected to edge of screen by tabs to pull screen flat horizontally.

B. Suspended, Electrically Operated Screens with Automatic Ceiling Closure, with Motor-in Roller, and with Tab Tensioning: Units designed and fabricated for suspended mounting; with bottom of case composed of two panels, fully enclosing screen, motor, and wiring; one panel

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hinged and designed to open and close automatically when screen is lowered and fully raised, the other removable or openable for access to interior of case.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Da-Lite Screen Company.

b. Draper Inc.

c. Stewart Filmscreen Corporation.

2. Provide metal or metal-lined wiring compartment.

3. Screen Case: Made from metal.

4. Provide screen case constructed to be installed with underside flush with ceiling.

5. Finish on Exposed Surfaces: Baked enamel.

2.3 FRONT-PROJECTION SCREEN MATERIAL

A. Matte-White Viewing Surface: Peak gain of not less than 0.9, and gain of not less than 0.8 at an angle of 50 degrees from the axis of the screen surface.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Da-Lite Screen Company.

b. Draper Inc.

c. Stewart Filmscreen Corporation.

B. Material: Vinyl-coated, glass-fiber fabric.

C. Mildew-Resistance Rating: Zero or 1 when tested according to ASTM G 21.

D. Flame Resistance: Passes NFPA 701.

E. Flame-Spread Index: Not greater than 75 when tested according to ASTM E 84.

F. Seamless Construction: Provide screens, in sizes indicated, without seams.

G. Edge Treatment: Without black masking borders.

H. Size of Viewing Surface: 72-1/2 by 116 inches.

I. Provide extra drop length of dimensions and at locations indicated.

1. Color: Same as viewing surface.

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PART 3 - EXECUTION

3.1 INSTALLATION

A. Install front-projection screens at locations indicated to comply with screen manufacturer's written instructions.

B. Install front-projection screens with screen cases in position and in relation to adjoining construction indicated. Securely anchor to supporting substrate in a manner that produces a smoothly operating screen with vertical edges plumb and viewing surface flat when screen is lowered.

1. Install low-voltage controls according to NFPA 70 and complying with manufacturer's written instructions.

a. Wiring Method: Install wiring in raceway except in accessible ceiling spaces and in gypsum board partitions where unenclosed wiring method may be used. Use UL-listed plenum cable in environmental air spaces, including plenum ceilings.

Conceal raceway and cables except in unfinished spaces.

2. Test electrically operated units to verify that screen controls, limit switches, closures, and other operating components are in optimum functioning condition.

3. Test manually operated units to verify that screen-operating components are in optimum functioning condition.

3.2 FRONT-PROJECTION SCREEN SCHEDULE

A. Electrically Operated, Front-Projection Screen Type: Suspended, with automatic ceiling closure.

1. Motor Configuration: Motor in roller.

2. Screen Surface: Matte white.

3. Size of Viewing Surface: 72-1/2 by 116 inches.

4. Extra Drop Length: As needed at top of screen for bottom of screen to be 36 inches above floor.

END OF SECTION 11 52 13