Cleanroom Fan Filter Replacement

When Should I Replace a Cleanroom Fan Filter?

Pre-Filter Replacement

Pre-filter media should be replaced every six months and inspected regularly. Pre-filters in gowning rooms should be inspected and replaced more frequently, as un-gowned individuals introduce more contamination before they’ve donned cleanroom attire. If pre-filters in the main cleanroom appear visibly dirty at less than six month intervals, inspection is beneficial every 2 – 3 months.
Pleated Type Prefilter

HEPA & ULPA Filter Replacement

As a HEPA filter loads with particulate, its resistance to airflow increases, forcing the fan to work harder to produce the required amount of air throughput. Pressure loss across the filter has a significant impact on the larger system at work. Although it is not uncommon that HEPA filters in medical device assembly last five or more years, proactive replacement prevents unnecessary energy costs.
Replacement NCR HEPA Filter, 2' x 2'
Replacement Gel Seal ULPA Filter, 2' x 2'
Replacement NCR HEPA Filter, 2' x 4'
Replacement Gel Seal ULPA Filter, 2' x 4'

Optimal Fan Filter Efficiency and Cost Savings

Yes, extending the operating life of a filter reduces overhead and maintenance costs. Longer filter life cycles increase energy use as the filter clogs with particulate. The energy penalty to move air through a dirty filter often outweighs the cost of replacement.

Operating a filter to its most extreme boundaries rarely has an economic advantage. Maximize performance and filtration investment by replacing dirty fan filters once the pressure drop has doubled from the initial installation value.

Fan Filter Servicing

Each fan filter can be changed out as needed. Unlike a dedicated air handling unit, filter servicing does not require shutting down an entire system. The unit in question can be shut down, while the other units can operate independently so that cleanliness of the space is maintained. Fan filter units are not only easy to service and maintain as needed, but also produce a much lower noise floor when in operation.

Reducing Air Handling Noise & Cleanroom Footprint

MicroSound Fan Filter Units include a 99.99% efficient HEPA filter, 30% ASHRAE pleated type prefilter, seismic clip suspension points, and a safety switch which disables the unit while servicing. A solid state variable speed control with RFI suppression allows fine-tuned airflow. 

MicroSound Fan Filter Units

Housings are fabricated from steel with a white powder coat finish. Final filters are protected with a white epoxy diamond pattern grille and are tested according to accepted procedures as described by the Institute of Environmental Sciences (IEST) and/or ISO standards.

Critical applications may require 99.99% efficient HEPA or 99.9995% efficient ULPA filters. An anodized aluminum frame holds the media which is protected by a diamond pattern white epoxy coated steel grille. Once the unit is removed from the housing removing and reinstalling the filter is , placing on a bench, removing and replacing the filter and re-installing the unit in the ceiling.

Need Info on a Specific Cleanroom Filter?

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Mitch Walleser

Mitch Walleser

Mitch works with manufacturing engineers and product specialists to examine new technology and products. His background includes 3D printing, electronics and cleanroom manufacturing. Stay up to date with new insights on automated production solutions by following on Twitter. @Go_to_PAC

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