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Smart Whisperflow Fan Filter Unit

Horizontal Laminar Flow Station

Horizontal Laminar Flow
Work area available in stainless steel (shown: No. 9620-64)
Features Key

A Fluorescent light standard, UV sterilization bulbs available
B Select Smart HEPA or ULPA fan/filter modules to provide a laminar flow of clean air
C Minihelic gauge measures filter backpressure
D Stainless steel work surface (available with electropolishing)
E Variable-speed blower adjusts air speed to meet containment requirements
F Options include vacuum, DI water and gas utilities
G Steel-reinforced nylon levelers resist most chemicals
H Status Indicator

cleanliness high

  • Stainless steel interior (side panels and work surface) ensure optimal cleanliness and chemical resistance for sensitive work in pharmaceuticals, biotechnology, and electronics
  • Multi-speed filter/blower modules provide a continuous wash of HEPA- or ULPA-filtered air; internal baffling plates and anodized aluminum diffuser panel ensure uniform air speed across the work area
  • Low-energy, electrically-commutated fan motor (ECM) reduces operating costs and enables remote, automatic monitoring and control of FFU
  • Take-up ducts along front and side edges minimize turbulence and backwash in the work area
  • Provides average air flow speed of 109 FPM (0.55 m/s) measured with 2'x4' HEPA FFU
  • Quiet operation of 40 dBA, measured at 12" (305 mm) from filter face
  • Built-in recessed illuminator provides diffused lighting without interfering with laminar flow
  • Electropolishing available to remove embedded subsurface particles in stainless steel surfaces
  • System options include undercounter storage cabinet and vacuum, gas and DI water petcocks

CE Wafer  

Horizontal Laminar Flow Station Illustration
contaminated air Contaminated Air
filtered air Filtered Air
  Take-up air slots and plenums on three sides of the work area ensure laminar flow.
Explosion Proof Hood
Explosion-Proof Fan/Filter Units available
Terra's Horizontal Laminar Flow Station provides an economical work environment that exceeds the most stringent contamination requirements in the pharmaceuticals, biotech, electronics and semiconductor industries.

Powerful low-energy filter/blower fan/filter modules provide a back-to-front laminar flow of filtered air across the work surface. The adjustable variable-speed, direct-drive blower lets you adjust air speed to meet your requirements. It also provides an industry-best low noise level of 40 dBA.

Select the filters to meet your requirement: HEPA filters are rated 99.99% efficient at removing particles 0.3 microns or larger, and ULPA filters are rated 99.999% efficient @ 0.12 micron particles. The low-profile design of these filter/fan units takes up minimal floor space while leaving plenty of working space with 28" (711 mm) of vertical clearance above the work surface. All models include a powder-coated steel stand with adjustable leveling feet that raises the work surface to 31" (787 mm) above the floor.

Return Air Ducts Maintain Laminar Flow and Keep Particles Out

For enhanced air-stream control, this station also features return ducts along the front and side edges of the work area. These ducts enhance system efficiency by reducing backwash, the most common source of turbulence in a laminar flow system.

On less sophisticated systems, an object placed near the front edge of a horizontal air-stream interrupts the laminar flow and provides an opportunity for unfiltered air to wash back into the work area, bringing contaminants with it. On Terra's system with return air ducts, inrushing air is drawn down through the ducts to the filter/blower before it can enter the work area. The flow of filtered air thus remains uniform across the work surface, and contaminants are drawn through the ducts and into the filter before they can contaminate work in progress.

Clean, Durable Construction

All materials used in this work station are selected for durability and contamination control. Interior surfaces, including the side panels and work surface, are 304 stainless steel; on an optional basis, these components can be electropolished to provide an ultra-clean finish free of subsurface contaminants. The exterior features a chip-resistant, powder-coated finish. The display panel, including the ON/OFF switch, Minihelic® backpressure gauge, and blower speed control, is mounted above the work area. For operational convenience, a duplex 115VAC/60Hz power outlet is included on a standard basis.

The Horizontal Laminar Flow Station also includes a recessed fluorescent lighting assembly that provides shadow-free illumination of the entire work area without disturbing the air flow.

Select HEPA or ULPA filter modules from the ordering table below.

Note: This work station is designed for particle-sensitive applications but does not protect operators against hazardous fumes, vapors or aerosols. See Terra's exhaust purification systems for operations involving hazardous fumes.

Construction: Fabricated from welded 16-gauge C.R. steel; includes adjustable levelers
Work Surface: 304 Stainless steel
Finish: Exterior surfaces feature a chip-resistant, powder-coat finish
Prefilters: Disposable fiberglass
Final Filters: Choice of HEPA (rated 99.99% efficient @ 0.3 µm particles) or ULPA (rated 99.999% efficient @ 0.12 µm particles)
Lighting: Fluorescent type. Recessed to eliminate air flow disturbance. Accepts lens for yellow light, if necessary
Fan/Motor : Brushless, 1/3-HP, electrically-commutated motor, centrifugal type with backward-inclined fans and sealed bearings; rated for continuous duty; furnished with overload protection
Average Airflow Velocity: 109 (± 10) FPM (0.55 m/s) at medium speed, measured 12" (305 mm) below filter face
FFU Air flow: 767 CFM (2’x4’ model) - all models rated at 109 FPM (0.55 m/s) at medium setting under HEPA filter load
Sound level: 40 dBA, measured no more than 12"(305 mm) from filter face @ 109 FPM (0.55 m/s)
Performance: Dust count exceeds Class 10 requirements (per Fed-Std 209E)
Backpressure Gauge: Minihelic®; gauge, 0 – 3" Water Column monitors backpressure across filter
Electrical: 115VAC, 50/60Hz, single phase (220VAC, 50/60Hz available). Consumes 280W/2.4A at the avg air speed. Meets the requirements of the National Electrical Code and applicable local codes. All components UL listed and CE marked
Options: Audible/visible filter alarm system (measures face velocity); ionizing system (including self-balancing power supply); petcocks for vacuum, DI water, or gas; electropolished stainless steel surfaces; special paint; special voltage and frequency
Minihelic® is a registered trademark of Dwyer Instruments incorporated
Horizontal Laminar Flow Station (order filter separately)
Overall Dimensions*
W" x D" x H"
Work Area
W" x D" x H"
No. of FFUs
Size of
required FFUs
(order below)
Horizontal Laminar Flow:
Interior Material**
304 Stainless Steel
Cat. # Price
52 x 44 x 63
(1321 x 1118 x 1600)
48 x 30 x 28
(1219 x 762 x 711)
1 2 x 4
(610 x 1219)
9620-63 $ 7,376
76 x 44 x 63
(1930 x 1118 x 1600)
72 x 30 x 28
(1829 x 762 x 711)
2 2 x 3
(610 x 914)
9620-64 $ 8,402
100 x 44 x 63
(2540 x 1118 x 1600)
96 x 30 x 28
(2438 x 762 x 711)
2 2 x 4
(610 x 1219)
9620-69 $ 9,089
Note: all models are 115VAC, 50/60Hz. For 220VAC, 50/60Hz model, add “-220” to the part number.
* All dimensions are nominal.
** Work top and interior side, rear and top panels are of material indicated. All exterior surfaces are powder-coated CR steel.

Petcocks Cat.# Price
Nitrogen/Clean Dry Air (CDA) 9620-07 $ 93
Vacuum 9620-08 $ 93
DI Water 9620-09 $ 93

Low-Energy Electrically-Commutated Smart WhisperFlow Fan/Filter Units
See chart above for quanity required.

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 $ 1,100
24 x 36 (600 x 905) 767 120VAC 6601-23-H-EC $ 1,000 6601-23-U-EC $ 1,100
24 x 24 (600 x 600) 520 120VAC 6601-22-H-EC $ 1,040 6601-22-U-EC $ 1,100
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 $ 1,211
24 x 24 (600 x 600) 557 240VAC 6601-22-H-EC-220 $ 1,100 6601-22-U-EC-220 $ 1,272
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. Their brushless DC motors have internal micro-processors to enable remote monitoring and control (such as off-hour energy-saving mode). ECM FFUs produce lower heat, vibration (0.0004 G) and decibel levels than mechanical AC motors.

Cleanroom Drawers

Right-side mounting is standard; specify other desired location when workstation is ordered. Stainless Steel Cleanroom Drawers Unit ABS Plastic Cleanroom Drawers Unit
Stainless Steel ABS Plastic
Cleanroom Drawers
No. of Drawers Min. Drawer
Height Inches
ABS Plastic Stainless Steel Electropolished
Stainless Steel
Cat.# Price Cat.# Price Cat.# Price
1 3
1740-23 $ 195
1 6
1740-02 $ 203 1741-20 $ 199 1741-26 Call TUI
1 12
1740-98 $ 290 1741-21 $ 249 1741-27 $ 578
2 3, 6 (76), (152) 1740-14 $ 354
2 6, 6 (152) 1740-15 $ 364 1741-22 $ 399 1741-28 Call TUI
2 6, 12 (152), (305) 1740-06 $ 401 1741-23 $ 449 1741-29 Call TUI
3 3, 6, 12
(76), (152), (305)
1740-07 $ 575
3 6, 6, 6
1740-09 $ 522 1741-24 $ 599 1741-30 Call TUI
4 3, 3, 6, 6
(76), (152)
1740-08 $ 664

Stainless Steel Cleanroom Drawers Unit

Units can be combined to expand working space: custom 12-foot wide
Horizontal Laminar Flow Hood (Ref. No. 215258)

File Type File Name Publication Date
White Paper (PDF) Vertical vs Horizontal Laminar Flow
Things to consider when deciding between vertical or horizontal flow. There are advantages and disadvantages to each airflow direction and hood design, depending on your application and laboratory lay-out.
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.
Manual (PDF) Horizontal Laminar Flow Station: Doc. # 1800-46
Manual (PDF) Ionizing Equipment (Ion Bar): Doc. # 1800-45
Quick-Start Operating Guide for Terra's IonBar Ionizing Bar, creating a balanced stream of positive and negative ions to combat ESD in your work station.
24-hour sales and tech phone support, M - F
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