Eckel Turnkey Anechoic Chambers

Eckel Industries Inc., designs, fabricates and installs full and hemi-anechoic chambers to presice specifications for government laboratories, industrial concerns, and leading universities. Totally integrated systems and designs include requirements such as isolated floors, light and power connections, ventilation, temperature and humidity control, instrumentation sleeves, control supports, working floors, and single and double sound doors.

Attenuating Structures
In order to obtain a suitable sound environment, the anechoic lining is installed in a proper noise isolating structure. This enclosure may be one of several types of construction built on an isolated floor, or floated on springs or other vibration isolation material.

Masonry
A masonry enclosure is typically used in new construction, or when the anechoic facility is planned as an integral part of a new building. An 8" or 12" masonry block usually provides adequate noise reduction. The addition of an inner panel room will provide increased noise reduction when required. Walls should be constructed on an isolated reinforced floor separated from the building floor or in a pit to allow the working floor in a chamber to be flush with the host room floor.

Panelized Rooms
Eckel Industries, Inc., provides enclosures built from Eckoustic panels with solid faces on both sides. Eckoustic panel rooms are completely pre-fabricated in the factory and can be quickly erected in an existing facility. These modular enclosures allow for flexible arrangements of doors and utilities. Doors are structurally and acoustically compatible with the wall construction. Hard spots or internal framing are provided for attachment of hardware. Penetrations for lights, power, instrumentation wiring, and ventilation are incorporated into the panel construction. Click here to find out more about our panel rooms.

Working Floors (Cable or Grating)



Since Anechoic Wedges are not designed to support heavy loads, a working floor must be provided over the top of the floor wedge points. Eckel Industries recommends two types for general use: spring tension cable floors and grating floors (expanded and subway grating).
Spring tensioned cable floors are best from an acoustical standpoint, whereas floor gratings are desirable where concentrated loads must be supported. Floor gratings are provided in sections so they can be removed during testing.

 Entrance Doors
The Anechoic Chambers entrance sound attenuating doors can be fabricated in a variety of designs, including swing-in or swing-out hinged type, sliding-wall type, or track-riding type. Also offered is the space-saving interlocking wedge door. Here, Anechoic wedges are mounted directly onto the door. When the door is swung open into the chamber, the wedge points interlock with those on the adjacent wall, minimizing the amount of lost space in the chamber.

Ventilation Design
The ventilation system in Eckel anechoic chambers is designed to maintain a uniform temperature, provide fresh air for humans and/or animals and facilitate proper combustion in air-consuming equipment. Ten to twelve air changes per hour of the free field volume will generally maintain uniform temperature and provide ample fresh air for humans or animals, while removing normal heat from lights, body radiation, and instrumentation.

Installation Procedure
Eckel anechoic linings are constructed according to a strictly supervised installation protocol. Chamber linings are installed on roll formed wedge tracks attached to wall and ceiling surfaces by means of a "Z" bar mounting system. As wedges are erected, the space between the wedges is filled with light density compressible fiberglass or melamine foam.

Instrumentation Hangers
Eckel installs all hangers and brackets required to support instrumentation and test specimens. This includes a network of all necessary cables or wires. Eckel provides engineering or design data pertinent to the support of any type of equipment within an anechoic chamber upon request to the purchasers, and their consultants or engineers.

Penetration Sleeves
Electrical power, wiring, and other services are introduced into the anechoic chamber by pipe sleeves that pass through the basic structure and wedges. Eckel Industries plans pipe penetrations carefully so that they enter the chamber through the valleys of the wedges and not the joints between the wedges.

Lighting, Electrical
Electric services are always installed in compliance with local or UL-approved regulations. Electric light, conduits, and outlets usually penetrate the structure through the wedge valleys and terminate at that point with the appropriate outlet or fixture.

Vibration Isolation


Anechoic Chambers shall be isolated from structural vibration by one of the following systems.




Reverberation Rooms
Eckel Reverberation Rooms are designed for the determination of sound output of noise sources, transmission loss of partitions, insertion loss of silencers, response characteristics of microphones, and random incedence absorption coefficients of materials.
Eckel reverberation rooms satisfy reverberant test requirements and meet specific interior sound levels and other environmental requirements necessary for proper test measurements.


Other Available Features
Eckel offers RF shielding, temperature and humidity control and other special features depending on client needs. Fiberglass cloth cover option protects against fiber migration, especially where the chamber will be incorporated into a wind tunnel test configuration.

Portable Anechoic Chambers

Portable Anechoic Chambers provide the necessary environment for conducting a wide variety of acoustic studies for improving product performance, for quality control of components and systems, and for developing products with lower noise output.

Applications of these chambers include:

Noise studies of small electronic, electrical, and mechanical equipment
Calibration of microphones
Free field response testing of loudspeakers
Determination of hearing aid characteristics
Behavior studies of small animals

These high performance chambers are available in a range of sizes, with low frequency cuttoffs from 150 Hz.
A line of standard models is offered, with various optional equipment available.

Features

• Outstanding Acoustic Performance The sound attenuating enclosure is lined with pretested anechoic wedges, as is the access door. In addition the floor system is non-reflective. This makes for an easily maintainable sound absorption level of between 99% and 100% inside the chamber.
  
• Easy Installation Standard Models are prefabricated in sections that are lined and fitted with accessories. These sections pass through an average door, and require only bolting for final assembly and use. Units can be quickly and safely moved to any area where they are needed. The chambers are engineered for long term operation.
• Acoustic and structural integrity is kept over the years. Provision for external electrical connections is standard
  
  The sound attenuating enclosure is lined with pretested anechoic wedges, as is the access door. In addition the floor system is non-reflective. This makes for an easily maintainable sound absorption level of between 99% and 100% inside the chamber.

The cabinet is fabricated of 3/4" waterproof plywood reinforced with 2" x 4" external framing and 14 GA. corner steel angles for the models through 666-250-3. The larger models in the 888 series are constructed with an outside cabinet of Eckel's patented acoustic modular panels. Corners at section joints are reinforced further with steel gussets. To prevent acoustic leaks, section joints are splined.

Anechoic wedges are mounted on the interior surface of the cabinet. Wedges available in low frequency cuttoffs of 150, 200, and 250 Hz are available. They are constructed of fiberous glass with metal bases and have individual point protection. The wedge covering depends upon the model selected.

Standard doors are 25" wide by the heights of the free field, and feature heavy-duty hardware, neoprene gaskets, and hinges for 180 degrees of swing. Wedges are mounted directly on the door and swing completely clear of the opening when the door is swung through a 180 degree arc.

Two 1" access sleeves are furnished, as well as one light fixture.

Exterior surfaces are primed and painted with off-white enamel on wood cabinet models; metal panel cabinets (888 models) have a paint grip galvanized finish.

The purpose of this checklist is to provide us with some specific information about your proposed Anechoic Chamber so that we can provide you with a more accurate assessment and accurate budget pricing.

Fill out the information as requested. Then at the end of the form supply us with your contact information and submit the form. You will receive a confirmation message from us shortly.