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WhisperFlow

Narrow Fan/Filter Unit

Narrow Fan Filter
Sixteen-inch-deep WhisperFlow HEPA fan/filter unit
fits into space-saving enclosures.
canada and us Ul logo CE logo
Models below are UL and UL-Canadian listed.
CE marked models available; inquire when ordering.

Optional Challenge Port
simplifies leak testing
Automated FFU control systems help meet FDA and other compliance regulations. Add options including environmental monitoring and data logging. Click for details
  • 16-inch WhisperFlow™ fan filter unit fits in space-saving enclosures for a smaller footprint
  • HEPA filter, rated at 99.99% effective with particles as small as 0.3 microns
  • Internal baffling plates and anodized aluminum diffuser panel provide uniform air speed across the filter face, ensuring laminar airflow
  • Quiet, low-vibration design: 16" x 4' model at medium speed is only 54 dBA, measured 12" (305 mm) from filter face @ 152 FPM (0.77 m/s)
  • Provides an average airflow velocity of 152+ feet per minute (0.77+ m/sec) and airflow of 685+ CFM (1164 m3/hr) under filter load at 100% medium setting (16" x 4', 406 mm x 1219 mm, model)
  • Three-setting switch simplifies air balancing
  • Meets IEST Recommended Practices

These reliable, self-powered Fan/Filter Units provide a uniform flow of microfiltered air to meet cleanliness standards down to Class 10 (ISO 4).

All models use a 3-setting (hi/med/lo), centrifugal-type fan/motor with permanently lubricated bearings mounted inside a white powder-coated steel housing with drop-in prefilter.

Advanced baffling technology ensures uniform airflow across the filter face and attenuates sound. HEPA (High-Efficiency Particulate Air) filters, rated 99.99% efficient at removing particles ≥ 0.3 microns, clean air efficiently. They provide years of no-maintenance, 24/7 operation, depending on your air quality.

Ordering Information
Note:
All models below include a HEPA or ULPA filter that feature an anodized aluminum frame and filter face grille. For highly sterile operations, an all-stainless steel filter is available, which features a 304 stainless steel filter frame and face grille that stand up better to alcohol and other cleaning agents. Ask your Terra sales representative for a quotation with current lead time on all-stainless steel FFUs.
Powder-Coated CR Steel Fan/Filter Units with HEPA Filter
Model
Width
W/D/H
Dimensions*
Inches
(mm)
Wt.
Lbs.
(Kg)
Avg.
CFM**
@ MS
(m3/h)
Airflow
ft/min(m/s)
Run Amps (Watts)
@ 60Hz
Power With HEPA Filter
HS MS LS HS MS LS Cat. # Price
4’ 48 x 16 x 13
(1219 x 406 x 330)
50
(23)
685
(1165)
172
(.87)
152
(.77)
148
(.75)
4.1A
(492W)
3.1A
(372W)
2.1A
(252W)
120VAC, 60 Hz 6601-1648-H Price
220VAC, 60 Hz 6601-1648-H-220 Price
3’ 36 x 16 x 13
(914 x 406 x 330)
42
(19)
424
(721)
130
(.66)
123
(.62)
111
(.56)
4.1A
(492W)
3.1A
(372W)
2.1A
(252W)
120VAC, 60 Hz 6601-1636-H Price
220VAC, 60 Hz 6601-1636-H-220 Price
2’ 24 x 16 x 13
(610 x 406 x 330)
34
(15.5)
340
(578)
153
(.78)
149
(.76)
127
(.65)
4.1A
(492W)
3.1A
(372W)
2.1A
(252W)
120VAC, 60 Hz 6601-1624-H Price
220VAC, 60 Hz 6601-1624-H-220 Price
* With pre-filter installed. Nominal height of CE-marked units is 13.5" (343mm).
**Average CFM at medium speed.
304 Stainless Steel Fan/Filter Units with HEPA Filter
Model
Width
W/D/H
Dimensions*
Inches
(mm)
Wt.
Lbs.
(Kg)
Avg.
CFM**
@ MS
(m3/h)
Airflow
ft/min(m/s)
Run Amps (Watts)
@ 60Hz
Power With HEPA Filter
HS MS LS HS MS LS Cat. # Price
4’ 48 x 16 x 13
(1219 x 406 x 330)
50
(23)
685
(1165)
172
(.87)
152
(.77)
148
(.75)
4.1A
(492W)
3.1A
(372W)
2.1A
(252W)
120VAC, 60 Hz 6601-1648-HS Price
220VAC, 60 Hz 6601-1648-HS-220 Price
3’ 36 x 16 x 13
(914 x 406 x 330)
42
(19)
424
(721)
130
(.66)
123
(.62)
111
(.56)
4.1A
(492W)
3.1A
(372W)
2.1A
(252W)
120VAC, 60 Hz 6601-1636-HS Price
220VAC, 60 Hz 6601-1636-HS-220 Price
2’ 24 x 16 x 13
(610 x 406 x 330)
34
(15.5)
340
(578)
153
(.78)
149
(.76)
127
(.65)
4.1A
(492W)
3.1A
(372W)
2.1A
(252W)
120VAC, 60 Hz 6601-1624-HS Price
220VAC, 60 Hz 6601-1624-HS-220 Price
* With pre-filter installed. Nominal height of CE-marked units is 13.5" (343mm).
**Average CFM at medium speed.

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

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

Cord Adapter
4pin Cord Adapter for FFUs
Connect your Terra Fan/Filter Unit directly to a wall outlet using this 12-foot cord adapter. FFUs are built with a 4-pin electrical connector for integration with a power module in a modular cleanroom or laminar flow hood. This adapter allows you to bridge the power connection when a power module is not used. Simply plug the 4-pin connector, that terminates in a NEMA 5-15 plug for connection, into the FFU power cord and fit the other end into a standard power outlet.

  Cat. # Price
Cord Adapter (4-pin) 120VAC, 60Hz 6601-13A Price

Terra FFU Replacement Filters
Type Filter Size / Inches ;(mm) Aluminum Frame
with Andodized Aluminum
Face Grille
304 Stainless Steel
with SS Face Grille
Cat. # Price Cat. # Price
HEPA 48 x 16 (1219 x 406)
6601-42 Price 6601-42-S Price
36 x 16 (914 x 406)
6601-41 Price 6601-41-S Price
24 x 16 (610 x 406)
6601-40 Price 6601-40-S Price

File Type File Name Publication Date
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
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