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Smart Whisperflow Fan Filter Unit

Smart WhisperFlow™ Fan Filter Units (FFUs)
With Low-Energy EC Motor

Smart WhisperFlow Fan Filter Unit
Smart WhisperFlow Fan Filter Unit Controls
Smart EC motors can be combined with automated FFU control to simplify pressure and flow balancing

Automated FFU control systems help meet FDA and other compliance regulations. Add options including environmental monitoring and data logging. Click for details

canada only UL
CE logo
Add "-CE" to 220 part numbers below.
Models below are UL and UL-Canada Listed.

 
  • EC brushless motors for efficient operation
  • Lower vibration than standard FFUs
  • Average airflow velocity of 109 FPM (0.55 m/s)
  • Low noise production—only 40 dBA
  • Incorporate into Building Maintenance Systems for greater control using on-board microprocessors
  • Remote monitoring and control
  • Includes pre-filter and main HEPA or ULPA filter to help meet ISO cleanliness standards 

These latest-generation WhisperFlow™ Fan Filter Units incorporate electronically commutated motors (ECM), variable speed, a proprietary baffling system and forward-curved centrifugal fans to reduce lifetime cost of ownership, increase operational performance and deliver uniform air flow. HEPA filters remove particles down to 0.3 um at 99.99% efficiency, and ULPA filters remove contaminants down to 0.12 um at 99.999% efficiency.

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. At medium setting, the sound level is 40 dBA (compared to 49-50 dBA for non-EC FFUs).

Using a smart control system, these consume only 280W/2.4A @109 FPM (0.55 m/s)—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 than AC FFUs, and provide a much wider flow range, from 110 to 1117 CFM, making them ideal for applications involving high static pressure.

When installed in hoods meant for precision applications, these EC FFUs reduce issues from vibration: at medium setting, an accelerometer measured only 0.0004 G from the unit. 

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.


  FEATURES & BENEFITS | Smart FFUs

Energy Efficient and Low Vibrations
Motor saves owner in operating costs and complies with low energy requirements. As well as reducing vibration noise obtaining a quiet lab environment.
Smart EC Motor
Allows automatic FFU control to simplify pressure and flow balancing.
Electronically Commutative
Provides room-by-room Smart monitoring and control of FFU’s to maintain target pressure, temperate, humidity and particle levels.

Smart WhisperFlow™ Types
Base Models
All-Stainless Steel Models
Reverse-Flow Ventilation Models
Room-Side Replaceable Models

Smart WhisperFlow Fan/Filter Units
Low-Energy Electrically-Commutated WhisperFlow Fan/Filter Units
W” x L” (mm) Max CFM
Power With HEPA Filter With ULPA Filter
Cat# Price Cat# Price
24 x 48 (600 x 1210) 1117 120VAC 6601-24-H-EC $ 1,037 6601-24-U-EC $ 1,155
24 x 36 (600 x 905) 767 120VAC 6601-23-H-EC $ 1,000 6601-23-U-EC Price
24 x 24 (600 x 600) 520 120VAC 6601-22-H-EC $ 1,040 6601-22-U-EC Price
24 x 48 (600 x 1210) 1183 240VAC 6601-24-H-EC-220 $ 1,100 6601-24-U-EC-220 $ 1,211
24 x 36 (600 x 905) 824 240VAC 6601-23-H-EC-220 $ 1,100 6601-23-U-EC-220 Price
24 x 24 (600 x 600) 557 240VAC 6601-22-H-EC-220 $ 1,100 6601-22-U-EC-220 Price

304 Stainless Steel Smart WhisperFlow Fan/Filter Units
Low-Energy Electrically-Commutated Stainless Steel Smart WhisperFlow Fan/Filter Units
W” x L” (mm) Max CFM
Power With HEPA Filter With ULPA Filter
Cat# Price Cat# Price
24 x 48 (600 x 1210) 1117 120VAC 6601-24-HSS-EC $ 1,666 6601-24-USS-EC $ 1,717
24 x 36 (600 x 905) 767 120VAC 6601-23-HSS-EC $ 1,666 6601-23-USS-EC $ 1,717
24 x 24 (600 x 600) 520 120VAC 6601-22-HSS-EC $ 1,666 6601-22-USS-EC $ 1,717
24 x 48 (600 x 1210) 1183 240VAC 6601-24-HSS-EC-220 $ 1,666 6601-24-USS-EC-220 $ 1,717
24 x 36 (600 x 905) 824 240VAC 6601-23-HSS-EC-220 $ 1,666 6601-23-USS-EC-220 $ 1,717
24 x 24 (600 x 600) 557 240VAC 6601-22-HSS-EC-220 $ 1,666 6601-22-USS-EC-220 $ 1,717
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Room-Side Replaceable Smart WhisperFlow Fan/Filter Units
Low-Energy Electrically-Commutated Roomside Replaceable Smart WhisperFlow Fan/Filter Units
W” x L” (mm) Max CFM
Power With HEPA Filter With ULPA Filter
Cat# Price Cat# Price
24 x 48 (600 x 1210) 1117 120VAC 6601-24-HR-EC $ 1,305 6601-24-UR-EC $ 1,415
24 x 36 (600 x 905) 767 120VAC 6601-23-HR-EC $ 1,305 6601-23-UR-EC $ 1,415
24 x 24 (600 x 600) 520 120VAC 6601-22-HR-EC $ 1,305 6601-22-UR-EC $ 1,415
24 x 48 (600 x 1210) 1183 240VAC 6601-24-HR-EC-220 $ 1,415 6601-24-UR-EC-220 $ 1,526
24 x 36 (600 x 905) 824 240VAC 6601-23-HR-EC-220 $ 1,415 6601-23-UR-EC-220 $ 1,526
24 x 24 (600 x 600) 557 240VAC 6601-22-HR-EC-220 $ 1,415 6601-22-UR-EC-220 $ 1,526
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Reverse-Flow (Ventilation) Smart WhisperFlow Fan/Filter Units
Low-Energy Electrically-Commutated Reverse-Flow (Ventilation) Smart WhisperFlow Fan/Filter Units
W” x L” (mm) Max CFM
Power With HEPA Filter With ULPA Filter
Cat# Price Cat# Price
24 x 48 (600 x 1210) 1117 120VAC 6601-24-HV-EC $ 1,305 6601-24-UV-EC $ 1,415
24 x 36 (600 x 905) 767 120VAC 6601-23-HV-EC $ 1,305 6601-23-UV-EC $ 1,415
24 x 24 (600 x 600) 520 120VAC 6601-22-HV-EC $ 1,305 6601-22-UV-EC $ 1,415
24 x 48 (600 x 1210) 1183 240VAC 6601-24-HV-EC-220 $ 1,415 6601-24-UV-EC-220 $ 1,526
24 x 36 (600 x 905) 824 240VAC 6601-23-HV-EC-220 $ 1,415 6601-23-UV-EC-220 $ 1,526
24 x 24 (600 x 600) 557 240VAC 6601-22-HV-EC-220 $ 1,415 6601-22-UV-EC-220 $ 1,526
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Filter Replacement Alarm System

This optional module monitors the efficiency of the HEPA filters and alerts personnel when the HEPA filters need to be replaced.  The module's Photohelic gauge connects to the nearest Fan/Filter Unit equipped with a Challenge Port (Part # 6601-99) and displays the backpressure created within the FFU.

Filter Replacement Alarm System

As the HEPA filter accumulates particles over its lifetime, pressure builds in the space between the blower and the HEPA filter.  The Photohelic gauge features two manually adjustable needles that are used to mark the original backpressure reading and the maximum acceptable level (which is typically double the backpressure reading of a new filter). When the backpressure exceeds this set limit, the LED indicator light located above the gauge will flash, notifying personnel that the room's HEPA filters should be replaced.

If a HEPA filter accumulates too many particles and becomes clogged, it can result in a loss of efficiency that can compromise the cleanroom's ISO rating.  If they are not replaced in a timely manner, severely clogged filters can destroy the motors in the Fan/Filter Units and potentially pose a fire hazard in the event of catastrophic electrical failure.

  Cat. # Price
Filter Replacement Alarm System 2625-54 Price

Ceiling-Module Mounting Frame
Stainless steel mounting frames allow ceiling modules to be installed in drywall or other hard ceilings without a ceiling grid.* The frames are sized to hold 2' x 4' fan/filter units or light panels, or 2' x 3' and 2' x 2' fan/filter.

Frames "cradle" the modules, and sit securely in the ceiling cut-out with support from top flange. Continuous seams in the 304 stainless steel frames' corners reduce deposit of contaminating particles and simplify cleaning.
FFU Mounting Frame
FFU Mounting Frame FFU Mounting Frame
Shown with Fan/Filter Unit installed, viewed from above ceiling panel. Ceiling module mounting frame:
2' x 4' shown, holding fan/filter
unit or light panel.
Description Cat. # Price
Mounting Frame: 2' x 4' 6604-02 Price
Mounting Frame: 2' x 3' 6604-01 Price
Mounting Frame: 2' x 2' 6604-00 Price
* Intended for use with supported ceilings that can safely bear the weight of fan/filter unit or light being installed. Mounting frame provides no support beyond the perimeter of the ceiling cut-out.


File Type File Name Publication Date
Manual (PDF) Smart WhisperFlow™ 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
Manual (PDF) Room-Side Replaceable Smart WhisperFlow™ Fan/Filter Units: Doc. #1788-25
See installation and maintenance instructions, along with specifications, for Terra's low-energy, Room-Side Replaceable ECM Fan/Filter Unit, installed in cleanrooms and hoods.
05/13/2016
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