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Ducted Filter Modules

Ducted Filter Modules

HEPA/ULPA WhisperFlow Modules include 12"-dia. flange
for ducting to remote air handler

Optional Challenge Port
simplifies leak testing
  • Low-profile design allows installation inside cleanrooms with standard 2’ x 4’ ceiling grids
  • Both HEPA or ULPA filter options available
  • 12" x 2"H collar included for attachment to air source
  • WhisperFlow™ fan/filter unit provides uniform face velocity
  • Room-Side Replaceable models allow easy filter replacement without breaching the ceiling
  • Provides years of no-maintenance, 24/7 operation depending on your air quality

Ducted Filter Modules provide HEPA or ULPA filtered air when connected to an air handler or other air source (required). They include a 12" x 2"H collar for attachment to the air source, which determines flow rate. An internal baffling system and diffuser plate ensure uniform face velocity.

Filters are mounted within the white powder-coated steel housing. Room-Side Replaceable models allow faster, cleaner filter replacement. A remote damper adjustment option is also available.

HEPA filters are rated 99.99% efficient at removing particles ≥ 0.3 microns; ULPA filters are rated 99.999% efficient at removing particles ≥ 0.12 microns.

A number of adjustable damper options are available; call to discuss your requirements.

All-Stainless Steel HEPA/ULPA Filters for Clean Operation and Enhanced Chemical Compatibility
All models below include a 304 stainless steel fan housing with HEPA or ULPA filter mounted in an anodized aluminum frame and an anodized aluminum filter face grille.
  For clean and sterile operations, an all-stainless steel filter is available, which includes 304 SS filter frame and face grille that stand up to alcohol and other cleaning agents. Ask your Terra sales representative for a quotation with current lead time on all-stainless steel models.
Ducted Filter Modules—Powder-Coated Steel
W x D
Standard Model Room-Side Replaceable
With HEPA Filter With ULPA Filter With HEPA Filter With ULPA Filter
Cat. # Price Cat. # Price Cat. # Price Cat. # Price
2' x 4' 6601-24-HD $ 332 6601-24-UD $ 477 6601-24-HDR $ 648 6601-24-UDR $ 743
2' x 3' 6601-23-HD $ 349 6601-23-UD Price 6601-23-HDR $ 648 6601-23-UDR Price
2' x 2' 6601-22-HD $ 369 6601-22-UD Price 6601-22-HDR $ 648 6601-22-UDR Price
Ducted Filter Modules—304 Stainless Steel
W x D
Standard Model Room-Side Replaceable
  HEPA Filter ULPA Filter HEPA Filter ULPA Filter
  Cat. # Price Cat. # Price Cat. # Price Cat. # Price
2' x 4' 6601-24-HDS $ 489 6601-24-UDS $ 630 6601-24-HDRS $ 927 6601-24-UDRS $ 1,056
2' x 3' 6601-23-HDS $ 489 6601-23-UDS Price 6601-23-HDRS $ 927 6601-23-UDRS Price
2' x 2' 6601-22-HDS $ 516 6601-22-UDS Price 6601-22-HDRS $ 927 6601-22-UDRS Price
Terra FFU Replacement Filters
Type Filter Size /
Feet (mm)
Aluminum Frame
with Andodized Aluminum
Face Grille
304 Stainless Steel
with SS Face Grille
Cat. # Price Cat. # Price
HEPA 2 x 2 (610 x 610)
6601-27 Price 6601-27-S Price
2 x 3 (610 x 914)
6601-26 Price 6601-26-S Price
2 x 4 (610 x 1219)
6601-25 Price 6601-25-S Price
ULPA 2 x 2 (610 x 610)
6601-30 Price 6601-30-S Price
2 x 3 (610 x 914)
6601-29 Price 6601-29-S Price
2 x 4 (610 x 1219)
6601-28 Price 6601-28-S 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.

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