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WhisperFlow

Room Side Replaceable Fan Filter Units (FFUs)

Roomside Replaceable FFU
Roomside Replaceable FFU
Gel channel that seals against "knife" edge on fan housing.

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
Available with both HEPA and ULPA filters, Room-Side Replaceable (RSR) WhisperFlow™ models allow filter replacement from the inside of the cleanroom. Because it eliminates the need for roof access or breaching the cleanroom, an RSR model greatly reduces maintenance time and costs.
  • Gel-sealed filter seats securely against blower housing to form a tight seal
  • Easy-open clips allow fast filter replacement from the room side without breaching the cleanroom ceiling
  • 304 stainless steel diffuser grille provides an easily sterilized surface within the cleanroom
  • Minimizes cleanroom downtime, eliminates the need for prolonged shut-downs just to change a filter
  • Select 99.99% efficient HEPA filter (99.99% efficient @ 0.3 µm particles) or ULPA filter (99.999% efficient @ 0.12 µm particles)

To service the filter, you simply rotate the retaining clamps and lower the gel-sealed filter unit away from the fan module, which remains in place in the ceiling grid structure. The new filter seals against the "knife" edge of the fan housing.

Filter shipped uninstalled to prevent shifting in the mounting gel that could cause leaks. 304 stainless steel housing available.
Automated FFU control systems help meet FDA and other compliance regulations. Add options including environmental monitoring and data logging. Click for details

For greater energy-efficiency, choose Smart WhisperFlow Fan Filters Units.

Ordering Information
Note:
All models below include a HEPA or ULPA filter that features an anodized aluminum frame and stainless steel 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 Steel Room Side Replaceable Fan/Filter Units
RSR WhisperFlow Fan/Filter Units with HEPA Filter
Model Nominal
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
2 x 4 23.63 x 47.63 x 15
(600 x 1210 x 381)
71
(32)
717
(1218)
115
(.58)
102
(.51)
93
(.47)
4.3A
(512W)
3.5A
(416W)
3.3A
(393W)
120VAC, 60 Hz 6601-24-HR $ 942
220VAC, 60 Hz 6601-24-HR-220 $ 1,112
2 x 3 23.63 x 35.63 x 15
(600 x 905 x 381)
53
(24)
602
(1023)
121
(.61)
116
(.59)
106
(.54)
4.1A
(500W)
3.1A
(378W)
2.7A
(329W)
120VAC, 60 Hz 6601-23-HR $ 942
220VAC, 60 Hz 6601-23-HR-220 $ 1,052
2 x 2 23.63 x 23.63 x 15
(600 x 600 x 381)
44
(20)
558
(948)
172
(.87)
166
(.84)
162
(.82)
3.9W
(472W)
2.8A
(339W)
2.4A
(290W)
120VAC, 60 Hz 6601-22-HR $ 942
220VAC, 60 Hz 6601-22-HR-220 $ 1,105
* With pre-filter and HEPA/ULPA filter installed. Nominal height 14.63" (372mm).

RSR WhisperFlow Fan/Filter Units with ULPA Filter
Model Nominal
Dimensions*
Inches
(mm)
Wt.
Lbs.
(Kg)
Avg.
CFM
@ MS
(m3/h)
Airflow ft/min(m/s) Run Amps (Watts)
@ 60Hz
Power With ULPA Filter
HS MS LS HS MS LS Cat. # Price
2 x 4 23.63 x 47.63 x 15
(600 x 1210 x 381)
71
(32)
717
(1218)
115
(.58)
102
(.51)
93
(.47)
4.3A
(512W)
3.5A
(416W)
3.3A
(393W)
120VAC, 60 Hz 6601-24-UR $ 1,052
220VAC, 60 Hz 6601-24-UR-220 $ 1,163
2 x 3 23.63 x 35.63 x 15
(600 x 905 x 381)
53
(24)
602
(1023)
121
(.61)
116
(.59)
106
(.54)
4.1A
(500W)
3.1A
(378W)
2.7A
(329W)
120VAC, 60 Hz 6601-23-UR Price
220VAC, 60 Hz 6601-23-UR-220 Price
2 x 2 23.63 x 23.63 x 15
(600 x 600 x 381)
44
(20)
558
(948)
172
(.87)
166
(.84)
162
(.82)
3.9W
(472W)
2.8A
(339W)
2.4A
(290W)
120VAC, 60 Hz 6601-22-UR Price
220VAC, 60 Hz 6601-22-UR-220 Price
* With pre-filter and HEPA/ULPA filter installed. Nominal height 14.63" (372mm).

304 Stainless Steel Room Side Replaceable Fan/Filter Units
RSR WhisperFlow 304 Stainless Steel Room Side Replaceable Fan/Filter Units
Model Nominal
Dimensions*
Inches
(mm)
Wt.
Lbs.
(Kg)
Power With HEPA Filter With ULPA Filter
Cat. # Price Cat. # Price
2 x 4 23.63 x 47.63 x 15
(600 x 1210 x 381)
71 (32) 120VAC, 60 Hz 6601-24-HRS $ 1,438 6601-24-URS $ 1,472
220VAC, 60 Hz 6601-24-HRS-220 $ 1,438 6601-24-URS-220 $ 1,472
2 x 3 23.63 x 35.63 x 15
(600 x 905 x 381)
53 (24) 120VAC, 60 Hz 6601-23-HRS $ 1,362 6601-23-URS Price
220VAC, 60 Hz 6601-23-HRS-220 $ 1,362 6601-23-URS-220 Price
2 x 2 23.63 x 23.63 x 15
(600 x 600 x 381)
44 (20) 120VAC, 60 Hz 6601-22-HRS $ 1,362 6601-22-URS Price
220VAC, 60 Hz 6601-22-HRS-220 $ 1,362 6601-22-URS-220 Price

Specifications
Dimensions: See ordering charts
Housing: Plenum is cold rolled steel finished with white powder baked enamel or 304 stainless steel. Compatible with 1-1/2" (38 mm) grid on 24" x 48" (610 mm x 1219 mm) centers or 2" (51 mm) grid on 24.5" x 48.5" (622 mm x 1232 mm) centers. Stainless steel available
HEPA Filter: HEPA filter is 99.99% efficient on removal of particles 0.3 microns and larger by DOP test. Replaceable filter is mounted in an aluminum frame (stainless steel frame available)
Prefilter: 20" x 20" x 1" (508 mm x 508 mm x 25 mm)– UL classified for Class 1; rated 80% efficient on linty dusts
Blower: Forward curved centrifugal type factory balanced. Entire motor/blower assembly is removable from top of housing for service
Motor: 1/4 HP Direct drive, energy efficient. Permanent split capacitor type. Thermally protected with automatic overload reset
Electrical: 3-speed motor switch (lo-med-high). Motor leads are wired to a cable with Mencom 4-pin connector for field connection to Terra cleanrooms and hoods; specify other required power cable.
Face Grille: 304 stainless steel
Noise Level: 50 dBA
Weight: See chart
Support: Receptacles provided for 1/4" (6 mm) eyebolts in all (4) corners for hangwire support. (eyebolts not included)

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

Terra FFU Replacement Filters
Type Filter Size / Feet (mm) Aluminum Frame
304 Stainless Steel Frame
Cat. # Price Cat. # Price
HEPA 2 x 2 (610 x 610)
6601-27-R Price 6601-27-RS Price
2 x 3 (610 x 914)
6601-26-R Price 6601-26-RS Price
2 x 4 (610 x 1219)
6601-25-R Price 6601-25-RS Price
ULPA 2 x 2 (610 x 610)
6601-30-R Price 6601-30-RS Price
2 x 3 (610 x 914)
6601-29-R Price 6601-29-RS Price
2 x 4 (610 x 1219)
6601-28-R Price 6601-28-RS Price

Cord Adapter
Connect your Terra Fan/Filter Unit directly to a wall outlet using this 3-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 6601-13 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
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
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