Project Description


Every cleanroom is unique so McLennan & Company offers a variety of wall systems and air systems to meet your desired specifications. McLennan & Company offers up to a Class 1,000 cleanroom, and as always, our highly qualified staff is readily available to assist you in every step of your purchase, from design to installation. There is no better choice for a turn-key modular cleanroom system than McLennan & Company.

A cleanroom is a facility that is designed for the purposes of certain fields of research such as biological or chemical research, and also for the manufacturing of certain products. These purposes tend to involve environmentally sensitive processes that require a sterile and uncontaminated environment. These processes are conducted with certain procedures that are intended to prevent the contamination of the environment such as with airborne particles and bacteria, procedures that range from a strict employee dress code, washing, isolated lockers and chambers, air showers, and thorough cleaning.

The design of the clean room itself employs HEPA and ULPA filters to facilitate an air flow through the facility that keeps out contaminants, generally with a positive pressure flow to push contaminants out, or a negative pressure system that keeps everything in, depending on the requirements.


Clean rooms follow a grading scale that measures the amount of allowable particulates in the air. The ISO system starts at ISO 1, which allows 10 or fewer particles per every 0.5 micrometer cubic area. The particles increase by a factor of 10 with every increase in the ISO rank. Another grading scale that is used is the US federal standard which is numbered 1, 10, 100, 10,000, and so on. Class 1 rooms have 1 particle for every 0.5 micrometer of cubic space, and so on, the Class numbers resembling the maximum amount of particles allowed in 0.5 cubic micrometers.


As for the filtration systems, clean rooms often use HEPA filters and ULPA filters. These filters can remove up to 99.9% of the particulates in the air using various air flow techniques. There are laminar air flow filters which employ unidirectional airflows; this means that air flows in a straight downward motion, cleaning any particulates. There is also a non-unidirectional airflow type which creates turbulent air conditions which can separate air particles from the air and clean the air that way. Some clean rooms employ a positive pressure to keep particles out, and then some employ negative pressure to keep contaminants in. It all depends on what needs to be done in the workspace.


It is no surprise that the need for a cleanroom can be overwhelming. Our experts can help with the confusion. The panels, windows, and doors common to our in-plant modular office system already meet your Class 1000, Class 10,000, and Class 100,000 needs. Our sales staff has the knowledge to combine our wall system with the appropriate cleanroom components to ensure your cleanroom meets your strict requirements.

Cleanrooms by McLennan & Company incorporate a hidden return air chase system. Utilizing the wall cavity itself in conjunction with properly sized return louvers, McLennan & Company is able to eliminate the expensive ductwork and/or chase walls often associated with hardwall modular cleanroom systems. This translates into a final product that is more attractive, less expensive, and easier to install.

McLennan & Company also works closely with our suppliers to guarantee that the specialty components such as sealed and gasketed light fixtures, cleanroom drop ceilings, and HEPA Fan filter units are readily available to insure we can continue to meet our industry leading delivery times.

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