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WhisperFlow® HEPA Fan Filter Unit designed for narrow hoods and other enclosure, 16
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Product Group:
6601-PP-17
6601-PP-17

16" Narrow WhisperFlow® Fan Filter Units

Manufactured By: Terra Universal
  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • 16" wide narrow fan filter unit fits in space-saving enclosures for a smaller footprint
  • Cleanroom FFU provides avg velocity of 90+ FPM, airflow of 640+ CFM at Medium speed
  • Three speed settings (Low/Medium/High) simplify air balancing
  • Internal baffling plate and diffuser panel provide quiet and uniform air flow across the filter face
  • Quiet, low-vibration FFU design: only 49 dBA, measured 30" from filter face @ 90 FPM

• Certified ISO Grade Design: ISO 5

• RoHS: Compliant

• Unit of Measure: of 1

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Stocked CE Mark Logo ULus Listed WhisperFlow BioSafe classic logo ISO 5 Icon
Manufactured By: Terra Universal
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 Terra Part #Price Ships in
120 V Powder-Coated Steel 16" x 24" HEPA Top Side 4-Pin 6601-1624-H $1,424 1-3 Days2
Quick Ship+ Available 37 in stock
120 V Powder-Coated Steel 16" x 36" HEPA Top Side 4-Pin 6601-1636A-H $1,424 1-3 Days3
Quick Ship+ Available Only 4 left in stock
120 V Powder-Coated Steel 16" x 48" HEPA Top Side 4-Pin 6601-1648-H $1,424 1-3 Days4
Quick Ship+ Available 22 in stock
240 V Powder-Coated Steel 16" x 24" HEPA Top Side 4-Pin 6601-1624-H-220 $1,424 1-3 Days5
Quick Ship+ Available 16 in stock
240 V Powder-Coated Steel 16" x 36" HEPA Top Side 4-Pin 6601-1636-H-220 $1,424 1-3 Days6
Quick Ship+ Available 13 in stock
240 V Powder-Coated Steel 16" x 48" HEPA Top Side 4-Pin 6601-1648-H-220 $1,424 1-3 Days7
Quick Ship+ Available Only 1 left in stock
240 V Stainless Steel 16" x 36" HEPA Top Side 6601-1636-HS-220 $954 1-3 Days8
Clearance Only 1 left in stock
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Product Details
Product Details
  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • 16" wide narrow fan filter unit fits in space-saving enclosures for a smaller footprint
  • Cleanroom FFU provides avg velocity of 90+ FPM, airflow of 640+ CFM at Medium speed
  • Three speed settings (Low/Medium/High) simplify air balancing
  • Internal baffling plate and diffuser panel provide quiet and uniform air flow across the filter face
  • Quiet, low-vibration FFU design: only 49 dBA, measured 30" from filter face @ 90 FPM
  • Performance Data and Submittals
  • Meets IEST Recommended Practices
  • HEPA (High-Efficiency Particulate Air) filters are rated 99.99% efficient at removing particles ≥ 0.3 microns
  • ULPA (Ultra-Low Penetration Air) filters are rated 99.999% efficient at removing particles ≥ 0.12 microns
  • Provides years of no-maintenance, 24/7 operation (depending on air quality)
  • Internal baffling plate and diffuser panel provide quiet uniform air flow across the filter face
  • 1/4-20 UNC threaded inserts on corners to allow suspension by guy-wires
  • MERV 7 pre-filter, 30% ASHRAE rated
  • Low-profile design is ideal for cleanrooms with limited ceiling space
  • Filters are leak tested in accordance with IEST standards and meet UL 900
  • See performance data and submittal sheets for additional information
  • Optional Accessories:
  •           Challenge port kit
  •           Power plug adapter
  •           Stainless surface mount frame for installing FFU in ceiling without T-grid
  •           12" ducted inlet connection adapter
  •           Replacement filter
  •           Filter replacement alarm
  •           Eye bolt package
  •           Ionizing bar
  •           Pre-filter safety cover, for CE conformance
  •           Control panel with night mode switch and power distribution modules

• Certified ISO Grade Design: ISO 5

• RoHS: Compliant

• Unit of Measure: of 1

• Marks & Listings: CE, UL, ULC

Show more

Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
Terra Universal WhisperFlow® Filter Fan Units
Overview video of Terra Universal's comprehensive portfolio of filter fan units Terra Universal WhisperFlow® Filter Fan Units Overview video of Terra Universal's comprehensive portfolio of filter fan units
Features & Benefits

Features and Benefits

Learn More: Filter Fan Units Prevent Infection
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Did You Know?
HEPA/ULPA Filters Do More Than Meet ISO Requirements - they also prevent infection.

Most cleanroom professionals understand that HEPA and ULPA filters capture contaminants that degrade particle-sensitive samples. But they also help remove bacteria, mold spores, and many viruses that contribute to a host of infections.

Most common bacteria are contained by the 0.3-micron pore size of high-efficiency particular air (HEPA) filters. Ultra-Low Penetration Air (ULPA) filters, which are rated 99.999% efficient at retaining particles of 0.12 microns and larger in diameter, capture ultra-fine contaminants, including many large viruses and mold spores.

These filters also remove aerosol-born pathogens - germs that hitch a ride on larger particles and liquid droplets that are captured in a HEPA or ULPA filter. HEPA- or ULPA-based Fan/Filter Units (FFUs) thus can play an important role in infection prevention in surgical theaters, ICUs and other medical settings.

Additionally, HEPA filters can help filter pollen, tiny insects, bacteria, mold, and other fungal spores that might be present during plant tissue culture or cannabis production. Contaminants such as these can find a way in via personnel or normal HVAC units and can blight crops and reduce yields. HEPA Filters help increase crop yields, pass inspection/meet regulations, and reduce contamination.

Here is a list of common human pathogens that HEPA/ULPA filters capture and remove from circulation:

Pathogens: Bacteria and Diseases
  • SARS-CoV-2: Coronavirus (COVID-19)
  • Escherichia coli: Gastrointestinal infection
  • Bacillus anthracis : Anthrax
  • Aspergillus brasiliensis: Sinus infections
  • Francisella tularensis: Tularemia
  • Bordetella pertussis : Whooping cough
  • Mycoplasma pneumoniae: Pneumonia
  • Chlamydia pneumoniae: Bronchitis
  • Chlamydia psittaci : Psittacosis
  • Klebsiella pneumoniae: Opportunistic infections
  • Haemophilus influenzae : Meningitis
  • Coxiella burnetii: Q fever
  • Pseudomonas aeruginosa: Opportunistic infections
  • Actinomyces israelii: Actinomycosis
  • Legionella pneumophila: Legionaire's disease
  • Thermoactinomyces sacchari: Farmer's lung
  • Alcaligenes: Opportunistic infections
  • Streptococcus pyogenes: Scarlet fever
  • Mycobacterium Tuberculosis: Tuberculosis

Protect Against Contaminants and Pathogens

HEPA and ULPA filters help capture many bacteria, viruses (COVID-19), and mold spores that contribute to a host of infections for both humans and plant/animal tissue cultures

Long Running FFU Motors

Terra’s filter fan unit motors are rated for 5 years of continuous, 24/7 operation, if the HEPA filters are consistently replaced. To accurately monitor your HEPA filter’s saturation levels, purchase Terra’s audible and visual filter replacement alarm system.

Airflow Uniformity Improves Laminar Flow

Non-uniform air speeds produce turbulence that can recirculate particles into the air stream. Unique WhisperFlow® FFU baffling system and anodized diffuser plate promotes uniform laminar airflow to minimize turbulence and effectively carry away contaminating particles.

Clean and Durable Powder Coat Finish

Terra’s signature white powder coat finish provides a high quality, durable barrier to protect against corrosion, plus a clean and attractive aesthetic. The advanced heat-fused formulation exceeds ASTM and ISO paint standards to resist chipping, scratching, fading, and wearing.

WhisperFlow Quiet Operation Reduces Distracting Background Noise

Exposure to loud noises can lower the ability to focus on work and listen selectively, which may also lead to safety issues. Typical AC units can be annoyingly loud, measuring in the range of 70 dB (comparable to a vacuum cleaner). Terra’s WhisperFlow design produces far lower noise levels for a quiet environment comparable to a library. At 90 ft/min output, units measure under 50 dB from only 1 ft away (roughly 75% quieter than 70dB).

Highest Standards For Electronic Components

Terra’s electronic components are designed and built to the highest standards required by defense and semiconductor industries for long-term reliability and protection against damage, injuries, and electrical hazards.

Catalog of CE-Marked Products

Terra offers over 1,700 CE-marked products configured for international voltage requirements

Products Compliant With Your ISO Rating

High-capacity, durable, ISO-compliant system rated for thousands of operating hours.
Available Accessories
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Energy-Efficient LED Lighting Panels

    Energy-Efficient Lighting

    Energy-efficient LED lighting panels and strips help to lower electrical costs and minimize heat build-up in temperature-controlled environments.
  • Fan Filter Unit Power Cord Adapter

    Cord Adapter, MIN4 PL to 16AWG Power Cord for Terra Fan/Filter Unit

    Four-pin power cord adapter for fan/filter unit allows connection to standard 120VAC/60Hz power receptacle.
  • Filter Replacement Alarm for Fan Filter Unit

    Filter Replacement Alarm

    The filter replacement alarm monitors filter backpressure and issues an alarm when filter needs replaced (requires selection of fan filter unit with challenge port, order separately).

  • Challenge Port for Fan Filter Unit

    Challenge port for Fan/Filter Units simplifies filter leak testing and connection of Filter Backpressure Alarm (shown with optional pressure gauge; must be ordered with FFU).
  • 2’x2’ replacement filter for roomside replaceable (RSR) Fan Filter Unit (FFU), inside view
    Learn More

    Replacement Filters

    Purchase replacement filters ahead of time to prevent costly operational interruptions and avoid damage to fan blowers caused by excessive backpressure from long overdue filter replacements.
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Manuals & Resources

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Call for pricing. FasTrak service fees cover costs of additional services only, without additional profit.

 * Terra's FasTrak services limited guarantee: to ship on the ESD or date specified OR to refund up to 100% of FasTrak charges. This guarantee covers no direct, special, consequential or other damages and is strictly limited to up to 100% of the amount paid for FasTrak service. When a specified ship date is missed due to factors outside Terra's control (vendor performance, deliveries by shipping companies, etc.) and random factors such as accidents, the credit of up to 100% of the FasTrak 24/7 may not apply. FasTrak service requested after order placement will be quoted and accepted based on available time remaining before required ship date.