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Low-Energy 4'x4' DC Fan Filter Units

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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
  • Electrically-commutated, direct-current motor (LE-DC) meets energy-saving directives
  • Uses exclusive backward-blower wheel design for energy-efficiency
  • Larger sized fan/filter unit (FFU) designed for spacious cleanrooms
  • 90 FPM average airflow velocity, measured 6" from diffuser screen
  • Room side replaceable (RSR) model allows in-room filter access
  • WhisperFlow™ FFU is a quiet, low-profile design; 51 dBA at 90 FPM
  • Ships standard with HEPA filter, rated at 99.99% efficient with particles 0.3 um or larger; 99.999% ULPA filter (for particles 0.12 um or larger) available
  • Manufactured from welded aluminum for durability
  • Meets IEST recommendations and cUL listed
Terra's LE-DC FFU satisfies requirements of the current energy-efficiency laws, including California's Title 24 and the European Union's ErP 2015 Directive. It's engineered with fewer components compared to standard fan/filter units, meaning easier installation and maintenance. The brushless, electrically-commutated motor is non-shedding and helps facilities stay in compliance with ISO cleanliness regulations.

Oversized FFUs are ideal for larger cleanrooms, increasing productivity of laminar airflow by requiring fewer ceiling grid support rails that cause interruptions. An internal plenum and baffle plate system within the FFU create consistent, homogenous airflow that helps with air balancing and the elimination of turbulence.

Room side replaceable units allow access to filters from inside the clean room. Change filters or perform maintenance without breeching the controlled environment; save down-time and money by avoiding re-certification.

Earn LEED (Leadership in Energy and Environmental Design) points using these modular FFUs to facilitate greater reduction in your operating costs.
Also available: 2' x 4' energy-saving Smart fan/filter units.
A wide range of configuration options is available, including CE marking and DOP (Dispersed Oil Particulate) test certification. Call Terra for a quotation.
Standard Models: Low-Energy Electrically-Commutated WhisperFlow Fan/Filter Units
W" x L" x D" (mm) (nominal) Max CFM (m^3/h) Power With HEPA Filter With ULPA Filter
Cat#   Cat#  
47.5 x 47.5 x 16.5 (1207 x 1207 x 419) 1950
120VAC 6601-44-H-DC $ 2,137
6601-44-U-DC $ 2,235
47.5 x 47.5 x 16.5 (1207 x 1207 x 419) 1950 120VAC 6601-44-H-DC-220 $ 2,137
6601-44-U-DC-220 $ 2,235
Room Side Replaceable: Low-Energy Electrically-Commutated WhisperFlow RSR Fan/Filter Units
W" x L" x D" (mm) (nominal) Max CFM (m^3/h) Power With HEPA Filter With ULPA Filter
Cat#   Cat#  
47.5 x 47.5 x 16.5 (1207 x 1207 x 419) 1950
120VAC 6601-44-HR-DC $ 2,608
6601-44-UR-DC $ 2,718
47.5 x 47.5 x 16.5 (1207 x 1207 x 419) 1950 120VAC 6601-44-HR-DC-220 $ 2,608
6601-44-UR-DC-220 $ 2,718

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
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