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Wenger Interactive Acoustic Absorber and Diffuser Panel Systems

Wenger offers decades of experience tailoring acoustical treatments to solve specific room acoustical control needs. The shape of your room, its floor and wall treatments, and its cubic volume play a role in how sound reacts within the space. Applying this expertise, Wenger's acoustics experts determine the optimal combination of absorber and diffuser panels to create the best possible sound. This specification section specifies Wenger's acoustically engineered wall and ceiling absorber panels and their array of convex and pyramidal diffuser panels. It also specifies the Wenger Quadratic Ceiling Diffuser Panel, which improves sound distribution allowing performers to better hear themselves and each other.

Wenger offers and recommends a free of charge full acoustical analysis to determine correct product selection, product quantities, and correct placements. Configuration of ceiling tiles and placement are addressed in the acoustical analysis.

We recommend you consult with your Wenger architectural representative, who can be contacted through: Wenger Corporation, Owatonna, MN, (800)493-6437, Email: , Website: www.wengercorp.com.

Founded in 1946, Wenger pioneered modular, relocatable, sound-isolated music practice rooms. Wenger has a proud history of manufacturing the finest products for Elementary and Secondary Music Education and Performance. Over the years, Wenger has expanded this tradition of quality by developing product solutions for the unique requirements of Colleges & Universities, Performing Arts Centers, Theatre, Places of Worship, Athletic Facilities, Rental and Event companies, as well as City, State and Federal Government organizations.

Today, Wenger is a global supplier of products with a reputation for durability and versatility providing customers with real value and proven return on their investment. Wenger also takes pride in offering technical support and expert consultation for new construction and renovation projects, as well as existing facilities.

Wenger products appear in the following CSI MasterFormat 2004™ Sections:

Section 01 35 13 - Special Project Procedures for Music Education Facilities

Section 08 34 72 - Sound Control Door Assemblies

Section 09 84 00 - Acoustic Room Components

Section 10 50 00 - Storage Specialties

Section 11 61 13 - Acoustical Shells

Section 11 61 15 - Acoustical Clouds

Section 11 61 23 - Folding and Portable Stages

Section 11 61 25 - Orchestra Pit Filler

Section 12 35 51 - Music Education Storage Casework

Section 13 21 48 - Sound-Conditioned Rooms

Specifier: The specifier may select CSI MasterFormat 95 or MasterFormat 2004 section numbering as required. Bold items require specifier selection. Convert bold to plain text and delete notes after editing.


[SECTION 09 84 00 – ACOUSTIC ROOM COMPONENTS]

[SECTION 09841 – ACOUSTIC PANELS]

PART 1 - GENERAL

1.1  SECTION INCLUDES

  1. [Wall] [and] [ceiling] mounted acoustical absorber and diffuser panels for engineered sound control system.

Specifier: Edit paragraphs below to correspond to project. Retain references to sections specifying work that might be expected to appear under work of this section. Delete Article if not required.

1.2  RELATED SECTIONS

  1. Division 01 Section "Special Project Procedures for Music Education Facilities" for coordinating installation of related products.

Specifier: Coordinate load-bearing capacity of ceiling grid specified in another section with requirements for support of ceiling-supported acoustical room components specified in this Section.

  1. Division 09 Section "Acoustical Panel Ceilings" for general purpose acoustical ceiling panels [and for grids serving as supports for ceiling mounted acoustical panels specified in this Section].
  2. Division 09 Section "Fixed Sound-Absorptive Panels" for general purpose sound absorptive panels specified using a single average NRC value.
  3. Division 09 Section "Interior Painting" for field painting of acoustical diffuser panels.
  4. Division 11 Section "Acoustical Shells" for fixed and movable sound-reflective components for performance spaces.

1.3  SYSTEM DESCRIPTION

  1. Provide a system of sound absorbing and sound diffusing panels in a configuration designed to reduce excess sound energy levels and improve sound distribution throughout the space.

Specifier: Retain references below remaining in section following editing. For projects of limited scope, delete Article.

1.4  REFERENCES

  1. American Society of Civil Engineers (ASCE):
  2. ASCE7 – Minimum Design Loads for Buildings and Other Structures.
  3. ASTM International (ASTM):
  4. ASTMC423 – Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method.
  5. ASTM C 612 – Specification for Mineral Fiber Block and Board Thermal Insulation.
  6. ASTME84 – Standard Test Method for Surface Burning Characteristics of Building Materials.
  7. ASTME336 – Standard Test Method for Measurement of Airborne Sound Insulation in Buildings.
  8. ASTM E 413 – Classification for Determination of Sound Transmission Class.
  9. ASTM E 795 – Practices for Mounting Test Specimens during Sound Absorption Tests.
  10. Underwriters Laboratories, Inc.:
  11. UL723 – Test For Surface Burning Characteristics of Building Materials.

1.5  PERFORMANCE REQUIREMENTS

Specifier: Retain and edit below for projects where noise reduction and reverberation time for each listed space has been engineered to accompany a design layout of acoustic components specified in Part 2. Copy and repeat subparagraphs below for each additional space receiving acoustic room components.

Consult Wenger representative for assistance in establishing appropriate performance requirements for each space as well as proper instrumentation requirements for measurement.

  1. Airborne Noise Reduction: Provide acoustical absorber and diffuser panels in layout designed by computer simulation based on Fitzroy formulas to provide the following sound reduction:
  2. Band Rehearsal: insert dB +/- 0.5dB.
  3. Orchestra Rehearsal: insert dB +/- 0.5dB.
  4. Choral Rehearsal: insert dB +/- 0.5dB.
  5. insert name of space: insert dB +/- 0.5dB.
  6. Reverberation Time: Provide acoustical absorber and diffuser panels in layout designed by computer simulation based on Fitzroy formulas to provide the following reverberation times:
  7. Band Rehearsal: insert +/- 0.2 seconds.
  8. Orchestra Rehearsal: insert +/- 0.2 seconds.
  9. Choral Rehearsal: insert +/- 0.2 seconds.
  10. insert name of space: insert +/- 0.2 seconds.

Specifier: Retain below or edit as required for ceiling mounted acoustic room components. Requirements are typically similar to those specified for general purpose acoustical panel ceiling installations to which ceiling-mounted items may be attached.

  1. Seismic Performance: Comply with ASCE7, "Minimum Design Loads for Buildings and Other Structures": Section9, "Earthquake Loads" based upon seismic design criteria indicated.

1.6  SUBMITTALS

  1. Product Data: Manufacturer’s data sheets, installation instructions, and maintenance recommendations for each type of acoustical absorber and diffuser panel.
  2. Include data indicating coefficients of absorption and Sabines per unit for each type of panel used in the analysis and proposed design layout.
  3. Product Test Reports: Indicating compliance of products with requirements, from a qualified independent testing agency.
  4. Shop Drawings: Prepared by manufacturer. Include elevations showing acoustic room components sizes, arrangements, and details of each condition of installation. Show fabrication and installation details.
  5. Indicate variations from basis of design unit sizes and layout shown on drawings, based upon performance of proposed products.
  6. Provide acoustic engineering calculation results and a graphic representation of each room's acoustical properties prior to and after installation of acoustical room components.
  7. Base calculations on proposed supplier's specific products.
  8. Indicate absorption and reverberation time properties complying with design requirements, utilizing octave band frequencies from 125 Hz to 4,000 Hz, based upon the Fitzroy formulas.
  9. Show room response at 125 to 4000 Hz octave bands empty, untreated and occupied, and treated and occupied.
  10. Calculations based upon NRC data alone do not meet the requirements of this specification.

Specifier: Retain applicable paragraphs below for projects intended to be LEED-certified. Add additional requirements that apply. Verify credits required and availability of materials from manufacturer(s). Refer to USGBC LEED Reference Guide for detailed information.

  1. LEED Submittals:
  2. Credit EQ4.4: Manufacturer’s certificate indicating that materials used in acoustic room components contain no urea formaldehyde.
  3. Samples: For each color and finish for each exposed acoustic room component:
  4. For fabric selection from manufacturer's full range of not less than 40 colors.
  5. Maintenance Data: Include fabric manufacturer's cleaning and stain-removal instructions.
  6. Warranty: Submit sample meeting warranty requirements of this Section.

1.7  QUALITY ASSURANCE

  1. Manufacturer Qualifications: Approved manufacturer listed in this section, with minimum [5] years experience in manufacture of acoustic room components.
  2. Manufacturers seeking approval must submit the following:
  3. Acoustical analysis and proposed layout for this project as described in Submittals Article above.
  4. Samples of each component of product specified, when requested by Architect.
  5. Project references: Minimum of 5 installations not less than [5] years old, with owner contact information.
  6. Sample warranty.
  7. Submit substitution request not less than 15 days prior to bid date.
  8. Approval will be indicated by issuance of written Addendum.
  9. Approved manufacturers must meet separate requirements of Submittals Article.
  10. Fire-Test-Response Characteristics per ASTME84 or ULStandard723: Flame spread index: 25 or less; Smoke developed index: 450 or less.

Specifier: Select one of two paragraphs that follow. Edit subparagraphs under second paragraph below to correspond to project. Wenger recommends requiring contractor to coordinate procurement of these related items in order to meet design requirements and avoid installation conflicts:

  1. Source Limitations: Obtain acoustic room components through one source from a single approved manufacturer.
  2. Source Limitations: Obtain the following products through one source from a single approved manufacturer[ in accordance with Division 01 Section "Special Project Procedures for Music Education Facilities"]:
  3. Sound control door assemblies.
  4. Acoustical room components.
  5. Acoustical shells.
  6. Acoustical clouds.
  7. Folding and portable stages and risers.
  8. Orchestra pit fillers.
  9. Music education storage casework.
  10. Sound conditioned rooms.

1.8  COORDINATION

  1. Coordinate requirements for blocking required in frame construction to receive acoustical absorber and diffuser panels.

1.9  DELIVERY, STORAGE, AND HANDLING

  1. Deliver, store, and handle acoustical absorber and diffuser panels in accordance with panel and fabric manufacturers' recommendations. Ship to jobsite only after roughing-in, painting work, and other related finish work has been completed and installation areas are ready to accept units and recommended temperature and humidity levels will be maintained during the remainder of construction.

1.10  WARRANTY

Specifier: The “special warranty” is a warranty provided by the manufacturer to the building owner. The warranty terms below are available from Wenger Corp. Verify that other manufacturers listed or seeking approval furnish warranty meeting requirements. Durability is a key aspect of Wenger’s product value for Owners. The available warranty reflects Wenger’s high confidence in the performance of their products.

  1. Special Warranty: Manufacturer's written warranty indicating manufacturer’s intent to repair or replace acoustical absorber and diffuser panels that fail in materials or workmanship within [5] years from date of Substantial Completion. Failures are defined to include, but are not limited to, the following:
  2. Fracturing or breaking of unit components which results from normal wear and tear and normal use other than vandalism.
  3. Delamination or other failures of glue bond of components.
  4. Warping of components not resulting from leaks, flooding, or other uncontrolled moisture or humidity.
  5. Failure of unit to perform acoustically in accordance with manufacturer's published data.

PART 2 - PRODUCTS

2.1  MANUFACTURERS

  1. Basis of Design: Acoustical absorber and diffuser panels design is based upon products of the manufacturer below. Provide basis of design product[, or comparable products of a listed manufacturer approved by the Architect prior to bid which will provide identical room acoustic performance to that provided by the products and configuration indicated].
  2. Wenger Corporation, Owatonna,MN; Telephone:(800)887-7145; Email: ; Website: www.wengercorp.com.
  3. [Specifier: Insert additional product manufacturers meeting requirements of Quality Assurance Article above, if required for project.]

2.2  MATERIALS

  1. Glass Fiber Board: ASTM C 612, Type 1A, 6 lb/cu. ft. (96 kg/cu.m) density molded rigid board, flame spread index 25 maximum, and smoke-developed index 450 maximum.
  2. Thermoplastic Sheet: PVC acrylic plastic sheet, flame spread index 25 maximum, and smoke-developed index 450 maximum.
  3. Fabric Facing Material: 100 percent woven plain weave polyester 2-ply, with the following characteristics:
  4. Light Fastness: AATCC 16, Option 3: 40 hours.
  5. Fastness to Crocking: AATCC 8: #4 Wet & Dry.
  6. Flammability: ASTM E 84, Class A or 1.
  7. Basis of design product: Guilford of Maine, FR-701.

Specifier: A combination of Wenger absorber and diffuser panels in an array matching the use and layout of each music rehearsal space is typically required to allow musicians and directors to hear all ensemble parts while protecting against echoes, flutters, and unsafe sound energy levels.

2.3  SOUND-ABSORBING AND SOUND-DIFFUSING PANELS

  1. General: Provide sound absorbing and sound-diffusing panels meeting requirements of Performance Requirements Article and requirements of this Article, with the following characteristics:
  2. Wall Panel Mounting Types for Acoustical Performance Characteristics according to ASTM E 795, with measurements determined according to ASTM C 423:
  3. A1: Mounted with 9/32 inch (7 mm) air space similar to actual practice.
  4. A: No air space.
  5. E-400: 16 inch (410 mm) air space.
  6. Ceiling Panel Mounting Types for Acoustical Performance Characteristics according to ASTM E 795, with measurements determined according to ASTM C 423:
  7. A: No air space.
  8. E-150: 6 inch (152 mm) air space.
  9. E-400: 16 inch (410 mm) air space.

Specifier: Wall and Ceiling Absorber Panels are designed to tailor the reverberation and loudness of a room. Flat in shape, absorber panels are engineered to absorb sound across a broader frequency range. Standard and custom sizes are available.

  1. Wall and Ceiling Absorber Panels: Manufacturer's standard panel, with fabric covering laminated to front face of rigid glass-fiber board, with chemically hardened edges, with the following characteristics:
  2. Basis of Design Product: Wenger Wall Absorber Panel and Ceiling Absorber Panel.
  3. Absorber Panel Size: 3 inch (80 mm) thick, width and length indicated.
  4. Fabric Covering: Manufacturer's standard, color and pattern as selected.
  5. Wall Panel Mounting Method: Metal wall bracket with panel-mounted z-bracket.
  6. Ceiling Panel Mounting Method: [Direct mount with brackets attached to panel back] [Wire suspension from brackets attached to panel back] [Lay-in ceiling grid clip].
  7. Acoustical Performance, One-third Octave Band Center Frequency, Hz, for 48 by 48 inch (1220 by 1220 mm) unit:

125 250 500 1000 2000 4000

Sound Absorption Coefficient