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Low-Energy DC Fan Filter Units

Low-Energy DC Fan Filter Unit
Models below are UL and UL-Canadian listed.
CE marked models available; inquire when ordering.
canada only UL CE logo
Automated FFU control systems help meet FDA and other compliance regulations. Add options including environmental monitoring and data logging. Click for details

These latest-generation WhisperFlow™ Fan Filter Units incorporate electronically commutated (EC) motors, a proprietary baffling system and backward-inclined fans to reduce lifetime cost of ownership and increase operational performance.

The low-energy, electrically-commutated (EC) fan/filter units comply with energy-efficiency standards such as California's Title 24 and the European Union's ErP 2015 Directive. Brushless DC motors have internal micro-processors, and lower decibel levels than mechanical AC motors.

Using a smart control system, these consume only 95 watts @90 FPM—greatly reducing cleanroom operating costs. They can help earn LEED (Leadership in Energy and Environmental Design) points, further reducing operating cost. They generate less heat and noise than AC FFUs, and provide a much wider flow range, from 110 to 980 CFM, making them ideal for applications involving high static pressure.

Their smart motor also allows greater control capabilities. Low-energy DC units can be incorporated into Building Management Systems to allow remote monitoring and control. They can also be adjusted via IR transmitters from inside the room, or via a remote touchscreen PLC console. Off-hour set-back feature puts the entire cleanroom in low-energy mode, saving additional energy costs when the room is not in use.

Low-Energy Electrically-Commutated WhisperFlow Fan/Filter Units
W” x L” (mm) Max CFM
(m^3/h)
Power With HEPA Filter With ULPA Filter
Cat# Price Cat# Price
24 x 48 (600 x 1210) 950 120VAC 6601-24-H-DC $ 923 6601-24-U-DC $ 974
24 x 36 (600 x 905) 628 120VAC 6601-23-H-DC $ 923 6601-23-U-DC Price
24 x 24 (600 x 600) 410 120VAC 6601-22-H-DC $ 924 6601-22-U-DC Price
24 x 48 (600 x 1210) 950 240VAC 6601-24-H-220-DC $ 1,312 6601-24-U-220-DC $ 1,307
24 x 36 (600 x 905) 628 240VAC 6601-23-H-220-DC $ 1,382 6601-23-U-220-DC Price
24 x 24 (600 x 600) 410 240VAC 6601-22-H-220-DC $ 1,307 6601-22-U-220-DC Price
Also available: 4’ x 4’ Low- Energy DC fan/filter units.

FFU Challenge Port

Air filters keep your environment clean, but validating their integrity can be cumbersome and knowing when to replace them is a challenge. Room designs, applications and staffing make each cleanroom unique. Therefore, it’s important to get baseline measurements of your equipment when first installed, and then set up a schedule for regular monitoring.

Tubing fits into both the orange challenge port valve and the Magnehelic® gauge to easily record FFU pressure differential.
Upgrade your fan/filter unit (FFU) to include a Terra-installed Challenge Port that both simplifies leak testing and helps establish a filter replacement schedule. The port is 3/8"-diameter, nickel-plated brass adapter fitting with a white polypropylene plug.

Learn more about Terra's FFU Challenge Port.

Price includes installation on specified FFUs.

FFU Challenge Port
Cat. # Price
6601-99 Price

File Type File Name Publication Date
White Paper (PDF) Airflow Uniformity and Fan Filter Units
Fan filter units help to remove contaminants from controlled environments. They are effective if designed well. Variables like speed and baffles contribute to an FFU's ability to maintain uniform air speed and direction. Read more about how FFUs help you comply with ISO and other regulations.
05/28/2015
White Paper (PDF) Cutting Cleanroom Costs
A few simple modifications to your cleanroom can increase efficiency, boost performance and slash operating expenses. Read about the steps you can take to optimize your controlled-environment facility.
05/15/2015
Tech Resource (PDF) HEPA and ULPA Particle Filters
HEPA and ULPA filters remove sub-micron particles from the air, which are too small to see but create BIG problems in many critical manufacturing operations. Read about filter capability and airflow resistance testing.
05/18/2015
Manual (PDF) Smart WhisperFlowâ„¢ Fan Filter Units: Doc. #1788-14
See installation and maintenance instructions, along with specifications, for Terra's low-energy, ECM Fan/Filter Unit, installed in cleanrooms and hoods.
05/13/2016
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