Our Cleanrooms


Hodess Cleanrooms

Hodess Construction Corp. is a general contractor with the expertise and know-how for cleanroom technology, design, and engineering. When you need a cleanroom, you need to hire an expert who understands design, construction and protocol. We at Hodess are cleanroom standards specialists who can provide both design/build (Turnkey) and plan and specification cleanrooms. We are also able to provide other cleanroom solutions, including modular cleanrooms, stick-built cleanrooms, stick-built modular cleanrooms and ISO Class 2 through ISO Class 8 cleanrooms for all your cleanroom technology needs. . We are also experienced with pharmaceutical cleanrooms, as well as dryrooms, clean dryrooms and battery rooms. Hodess can provide white rooms, environmentally controlled spaces including BSL 1, BSL 2, BSL 3 and BSL 4 labs. We have built cleanrooms for General Electric, Millipore Corporation, Amgen, National Semiconductor, R.F. Micro Devices, Digital Equipment Corporation and many more.

Cleanroom Levels

Cleanrooms are defined by their level of cleanliness, more specifically the amount of particles found in the air. Cleanroom classifications include a class 1 cleanroom or ISO class 3, which is today’s standard, typically has one .5 micron sized particle per cubic foot of air, for which a typical HEPA is rated. Cleanrooms range up to class 100,000 or ISO class 8 which include up to 100,000 particles at .5 microns. A micron (denoted as µm) is one millionth of a meter. A typical human hair is about 80 µm wide. The types of filters used can also affect cleanliness. The HEPA filter (high efficiency particular arrestor) can give you class 1 through 100,000 at .5 microns depending on the quantities and the air flows used in the design. To meet a higher cleanliness level and smaller particulate level ULPA filters (ultra low particulate arrestors) are used to reduce particles sized down to .3 microns or less.

The cleanliness level of a cleanroom is typically set at the beginning through the cleanroom design analysis and depends on the product to be made. In some cases, particulate can have a crucial impact on the performance of the product. In other cases it can contaminate the product. The various cleanroom types, cleanroom air delivery systems, and analysis of the process and the design help determine the level of cleanliness to be accomplished.

With today’s cleanroom technology, they are tending to certify at least one classification cleaner at rest than specified. However, the amount of air used to certify a cleanroom as specified in the ISO standards can vary. A facility’s energy savings, which helps the competitive nature of businesses, depends on the type of process used and the protocol maintained. These savings can be accomplished by specifying different levels of cleanliness or operating systems in such a manner that the level of cleanliness maintained meets the qualifications, but uses control systems such as particulate counters, to maintain but not exceed the cleanliness level.

Cleanrooms are typically energy inefficient compared to standard building systems. This is because pressure, temperature, humidity, particulate levels, light levels, static levels, sound levels, vibration levels and other criteria can critically impact the performance of the product being made in the cleanroom. Controls are employed through the mechanical, electrical and process systems to ensure that systems do not impact the product and in fact in many cases enhance the product. As a result, the tighter control means more energy expended to control these variables.