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WhisperFlow

Heated Fan Filter Units (FFUs)

Roomside Replaceable FFU
Fast, safe parts drying or elevated temperature testing (shown: No. 6601-24-HT)

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
Available with both HEPA and ULPA filters, in both standard and Room-Side Replaceable (RSR) configurations, these heated WhisperFlow fan/filter modules include a heating element mounted inside the FFU housing that heats air up to 150 degrees Fahrenheit.
  • Accelerates parts drying following cleaning and sterilization
  • Ideal for biocompatibility testing or other processes at elevated temperatures
  • Maintains product integrity by removing sub-micron contaminants
  • Room-side replaceable models include gel-sealed filter for easy replacement inside Terra Vertical Laminar Flow Workstation or other enclosure
  • 304 stainless steel diffuser grille provides an easily sterilized surface
  • Unique baffling and sound-deadening technology ensure uniform face velocity and ultra-quiet operation (50 dBA)
  • Select 99.99% efficient HEPA filter (99.99% efficient @ 0.3 µm particles) or ULPA filter (99.999% efficient @ 0.12 µm particles)
These heated fan/filter units provide micro-filtered air to meet cleanliness standards to ISO 4 (Class 10). Room-Side Replaceable Models Ideal for Use in Laminar Flow Clean Benches RSR models allow fast filter replacement without the need for special tools. 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.

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.
Heated WhisperFlow Fan/Filter Units
Heated 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-UT $ 1,475
220VAC, 60 Hz 6601-24-UT-220 $ 1,602
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-UT $ 1,475
220VAC, 60 Hz 6601-23-UT-220 $ 1,602
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)
3.9A
(472W)
2.8A
(339W)
2.4A
(290W)
120VAC, 60 Hz 6601-22-UT $ 1,475
220VAC, 60 Hz 6601-22-UT-220 $ 1,602
* Available with ULPA filter only. Nominal height 14.63" (372mm).

Heated Room Side Replaceable Fan/Filter Units

Heated 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-URT $ 1,779
220VAC, 60 Hz 6601-24-URT-220 $ 1,906
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-URT $ 1,779
220VAC, 60 Hz 6601-23-URT-220 $ 1,906
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)
3.9A
(472W)
2.8A
(339W)
2.4A
(290W)
120VAC, 60 Hz 6601-22-URT $ 1,779
220VAC, 60 Hz 6601-22-URT-220 $ 1,906
* Available with ULPA filter only. Nominal height 14.63" (372mm).

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 and a buzzer will sound, notifying personnel that the room's HEPA filters should be replaced. An override switch silences the buzzer, but the light continues to flash until the filter is 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 2625-54B-SS $ 1,140

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 $ 67

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 $ 437 6601-27-RS Call TUI
2 x 3 (610 x 914)
6601-26-R $ 483 6601-26-RS $ 640
2 x 4 (610 x 1219)
6601-25-R $ 510 6601-25-RS $ 672
ULPA 2 x 2 (610 x 610)
6601-30-R $ 446 6601-30-RS $ 591
2 x 3 (610 x 914)
6601-29-R $ 518 6601-29-RS $ 686
2 x 4 (610 x 1219)
6601-28-R $ 547 6601-28-RS $ 724

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 $ 50

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 $ 269
Mounting Frame: 2' x 3' 6604-01 $ 261
Mounting Frame: 2' x 2' 6604-00 $ 254
* 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.

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