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Clean Rooms Are the Cleanest Environments in the World


What is a Clean Room?

A clean room is a controlled area that maintains control over particle contamination as well as other contaminants such as chemicals. Clean rooms are common in many industries, such as the pharmaceutical, medical device, electronics, aerospace, food and beverage, optics, flat panel and even the automotive industry.


Why is a Clean Room so Clean?

Clean rooms are clean because they filter the air through HEPA filters from 5 to 500 times per hour and they positively pressurize the space to keep unwanted contaminants out and of the room.

The EPA is currently recommending a minimum of roughly 5 air changes per hour.


What is a HEPA Filter?

HEPA is an acronym for "High Efficiency Particulate Air. HEPA is a type of filter that can trap a large amount of very small particles.

To qualify as HEPA by industry standards, an air filter must remove 99.97% of particles that have a size greater-than-or-equal-to 0.3 µm

THE EPA has stated: “High-efficiency fibrous media filters (e.g., with high MERV or HEPA rated) and activated carbon sorbent media filters have generally been shown to be the most effective while having the fewest limitations or adverse consequences.


How do I turn my room into a clean room like environment?

Step 1: Utilize a certified HEPA filter to remove particulate matter from the room.

Step 2: Positively pressurize the room to keep unwanted contaminants out of the air.

Step 3: Filter the air in the room as many time as possible. The more air exchanges you have per hour through a HEPA filter the cleaner the room will be.


Air Changes Per Hour

Air changes per hour, abbreviated ACPH or ACH, or air change rate is a measure of how many times the air within a defined space is replaced. The higher the filtered air rate the cleaner the air will be and the opposite is true. The lower the rate the dirtier the air will be.

The EPA (Environmental Protection Agency) recommends a minimum of roughly 5 air changes per hour. This is critical to understand so as to chose the appropriate air purifier for the size of the room you want to clean.

The following chart was taken from the EPA document. This chart is based on the minimum recommended level:


Sound vs Flow

The challenge in air filtration has been balancing the amount of air being output vs the sound or decibel level of the air purifier. The more air that is output the cleaner the room is and the louder the air purifier is. At night most people put their air purifier into “Night Mode” which greatly reduces the amount of clean air being put out and often renders the air purifier ineffective. FILTR has smashed the sound barrier and is able to output up to 200 CFM at a decibel level of 35 dB

As a point of reference here is a chart showing various reference sound levels:

  • Leaves rustling - 10 dB
  • Whisper – 25 dB
  • Quiet Office – 40 dB
  • Normal conversation – 60 dB
  • Vacuum Cleaner/Washing Machine – 70 dB