Provides Controlled Environment

Legend Hardwall Cleanroom Wall Panels and Components are engineered to provide a secure controlled environment within the cleanroom.

Ultra-smooth surface wall panels, framing and ceiling components assure consistent pressure in the cleanroom and constant control of air-born particles. As a result, Legend Cleanroom Systems achieve very high cleanroom performance standards.

Non-Progressive Design

The Legend wall panel and framing modular design reduces lead time which assures that the cleanroom is in operation ontime and within budget. As needs change in the future, Legend wall panel modular design offers the ability to relocate or expand the cleanroom in the future.

Special Sizes

Legend wall panel composition and the modular panel construction fulfills requirements for any hardwall cleanroom design and layout. Wall panels can be made in special sizes for entry areas, gowning rooms and air-locks, ensuring that the cleanroom pressure remains constant. Extra-high Legend wall panel systems can accommodate large equipment which require ceilings higher than the standard eight (8) feet.

Load Considerations

Three factors are considered when determining which wall system to use for load-bearing cleanrooms. The first factor is the amount of total weight on the cleanroom wall, the
second factor is the span distance between all four (4) of the cleanroom walls and the third factor is the height of the wall. Consult with the factory for detailed information about your cleanroom project.

Once Through Design

Once-Thru Design is also known as single pass. Ambient air is drawn into the SAM Fan Filter Units at ceiling level. The filtered air passes into the cleanroom and is transferred out of the room through grilles at the bottom of the walls. Refer to Fig. 1 and Fig. 2.

Recirculating Design

Recirculating cleanrooms are ideal when temperature or humidity control is required.

Conditioned air inside the plenum space is drawn into the SAM Fan Filter Units and the filtered air then passes into the cleanroom. Air from the cleanroom is forced into the return air grilles located in the lower wall sections and is recirculated up the return air chases within the walls to the plenum. Air is mixed with make-up air inside the plenum and drawn thru the SAM units again. Refer to Fig. 3 and Fig. 4.

Once-Thru Design Hardwall Cleanroom

Once-Thru Design Hardwall Cleanroom

Once-Thru Design Hardwall Cleanroom

Once-Thru Design Hardwall Cleanroom
How Are Cleanroom Standards Determined?

The number and size of particles allowed in the room determines the classification of air cleanliness. As the process in the cleanroom grows less critical, greater quantities of invisible particles may be present without risk, thus the numerical classification of the cleanroom will be higher.

The simple designations of the early U.S. Federal Standard 209, in which a class number was a statement of the number of 0.5 micron particles per cubic foot of air, are gone.
Although Federal Standard 209 is most commonly used in the United States, it is now officially retired as of late November, 2001.

The ISO 14644-1 document became mandatory in the European union on November 1, 1999 and is now the worldwide baseline measurement for cleanrooms. Organizations with ISO 9000 certifi cation are now required to utilize ISO 14644-1 for defining clean spaces.

Guidelines For Selecting Filters

During the initial quotation, design and engineering phases our staff will make the calculations necessary to achieve the desired ISO or U.S. Federal Standard 209 Class. The
correct quantity of HEPA or ULPA grade filters will be selected using air changes per hour as the most effective method for meeting class requirements. Right from the
start our staff will work with your technical staff to determine if extra-ordinary design issues must be addressed.

Installation, Testing and Certification

Customers with in-house contracting or installation capability appreciate the simplicity and easy installation of the Legend Cleanroom Systems.

A network of Authorized Installers enables Clean Rooms International to offer complete installation services. Testing and certification by an independent contractor can be
arranged as well.

Whether you choose to install a room yourself or use a CRI Authorized Installer, our staff serves as a liaison and guides the construction or installation process.

Accelerated Depreciation

Conventional construction becomes a permanent part of the host building and requires the straight-line method of depreciation over as long as 39 years, depending upon
current law. A shorter depreciation life for the modular cleanroom results in a quicker write-off and faster payback for the cost of the room.

Modular cleanrooms built from our Legend Cleanroom System can qualify for accelerated depreciation vs. conventional construction because our cleanrooms can be dismantled and moved to another location. Consult with your accountant to determine if favorable depreciation rules apply to your purchase of a Legend Cleanroom System.

Cleanliness Standards and Airborne Contaminant Size

Cleanliness Standards and Airborne Contaminant Size

Cleanliness Standards and Airborne Contaminant Size
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