Select Product


Filter Type

Terra Part #PriceShips in
2'x2'HEPA 6601-27 49248 $4551-3 Days2
In stock
2'x2'HEPA, RSR 6601-27-R 53295 $5861-3 Days3
In stock
2'x2'ULPA, RSR 6601-30-R 53298 $5991-3 Days4
In stock
2'x2'ULPA 6601-30 49251 $4591-3 Days5
In stock
2'x3'HEPA 6601-26 49247 $5331-3 Days6
In stock
2'x3'HEPA, RSR 6601-26-R 53294 $6501-3 Days7
In stock
2'x3'ULPA, RSR 6601-29-R 53297 $6971-3 Days8
In stock
2'x3'ULPA 6601-29 49250 $5521-3 Days9
In stock
2'x4'HEPA 6601-25 49245 $5361-3 Days10
In stock
2'x4'HEPA, RSR 6601-25-R 53293 $6881-3 Days11
In stock
2'x4'ULPA, RSR 6601-28-R 53296 $7381-3 Days12
In stock
2'x4'ULPA 6601-28 49249 $5521-3 Days13
In stock
14" x 19.5"MERV 7 Pre-Filter 6601-34-B 73640 $1821-3 Days14
Only 7 left in stock
16" x 24"HEPA 6601-40 60518 $3991-3 Days15
In stock
16" x 24"ULPA 6601-43 67143 $4075-7 Days16
In stock soon
16" x 36"HEPA 6601-41 60519 $5391-3 Days17
In stock
16" x 36"ULPA 6601-32 70390 $4071-3 Days18
In stock soon
16" x 48"HEPA 6601-42 60520 $5131-3 Days19
In stock
16" x 48"ULPA 6601-33 70391 Request Quote1-3 Days20
In stock soon
19.5" x 19.5"MERV 7 Pre-Filter 6601-34 73638 $1821-3 Days21
In stock
2'x4'ULPA 6601-28-S 60769 $1,0021-3 Days22
In stock
2'x3'ULPA 6601-29-S 60770 $1,0921-3 Days23
In stock
2'x2'ULPA 6601-30-S 60771 $8911-3 Days24
In stock
2'x4'ULPA, RSR 6601-28-RS 60775 $1,1201-3 Days25
In stock
2'x3'ULPA, RSR 6601-29-RS 60776 $9311-3 Days26
In stock
2'x2'ULPA, RSR 6601-30-RS 60777 $8011-3 Days27
In stock
16" x 48"HEPA 6601-42-S 60932 Request Quote28-30 Days28
Only 3 left in stock
16" x 24"ULPA 6601-43-S 70389 $7931-3 Days29
In stock
16" x 36"ULPA 6601-32-S 70392 $9411-3 Days30
In stock
16" x 48"ULPA 6601-33-S 70393 $1,0061-3 Days31
In stock
Filter Type
Item ordered before. Click on bagde to see the order.

Up to 30-day trial periods, free return shipping and on-site training available for qualified equipment.

Request demo from your product specialist or add note to your order or quote request.

Some ship in:
Usually Ships in:
Free shipping in contiguous USA
Custom-configured product: Terra will quote.
Custom-configured product: Terra will quote.
Select a product line for product summary

Product Details

  • Find the right replacement HEPA/ULPA filter for your FFU (Fan-Filter Unit)
  • Compatible with all industry-standard FFU brands in 2' x 2', 2' x 3' and 2' x 4' sizes
  • Large quantities in-stock and packaged for immediate shipment
  • The best way to find the correct replacement filter is by referencing the serial number of your existing filter. Call or chat with a live product specialist if you need help confirming the correct replacement part#.
  • Because filters are delicate and subject to damage during handling, all filter sales are final; no failure claims can be accepted.

Unit of Measure: of 1

Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
Terra Universal WhisperFlow® Filter Fan Units

Features & Benefits

Features & Benefits

Filter Fan Units Prevent Infection

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 pertusis : Whooping cough
  • Mycoplasma pneumoniae: Pneumonia
  • Chlamydia pneumoniae: Bronchitis
  • Clamydia 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
  • Alkaligenes: Opportunistic infections
  • Streptococcus pyogenes: Scarlet fever
  • Mycobacterium Tuberculosis: Tuberculosis
HEPA/ULPA filtration diagram with examples of filtered contaminants

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.

Continuous Product Improvement

At Terra, we strive to develop and produce the highest quality products for our customers to improve health, safety, performance, and yields. Our product quality is enabled by high-grade manufacturing equipment and processes, 45 years of engineering and application expertise, and our commitment to continuously improve.

Comprehensive Product Portfolio

Terra’s comprehensive product portfolio includes solutions for every application and budget. Our technical sales staff will guide you toward the product most suitable for your requirements.

Long-Term Customers

Terra is committed to building long-term relationships with satisfied clients; 94% of orders each year come from repeat customers

Complete Project Transparency

Terra is dedicated to complete transparency on project status, shipment tracking, and installation scheduling

Available Accessories

Popular Accessories

For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Energy-Efficient Lighting
    Energy-efficient LED lighting panels and strips help to lower electrical costs and minimize heat build-up in temperature-controlled environments.
  • IonBar Ionizing Bar with FFU Installation Kit
    Generates a stream of positive and negative ions to neutralize surface static charges, protecting sensitive parts against ESD
  • 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.

Products similar to this one

Buy Accessories

Manuals & Resources

Manuals & Resources

Selecting the Proper Air Filter and Air Filter Gauge

On a tight schedule? Choose FasTrak 24/7 Priority Service to help meet your critical schedule for Terra-manufactured products, either before or after your order is placed.*

  • FasTrak 24/7 provides a 24/7 commitment to meet the shipping date YOU specify, regardless of quoted lead times.
  • FasTrak 24/7 assigns a dedicated production team plus a dedicated senior expeditor working three shifts to meet your delivery specification.
  • FasTrak 24/7 guarantees* to meet the agreed-to specified ship date.

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.

You need at least 2 products to compare Compare Clear All
Compare Products