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The largest Bonsai FFU: the widest clean-air work area in the lineup.

  • 4' x 2' true H14 HEPA filter, 99.995% at 0.3 micron
  • ISO Class 5 / Class 100 clean air
  • 3-speed aluminum blower, up to 160 FPM
  • Washable magnetic pre-filter; only 14" deep
  • Plugs into a standard 120V outlet; 18-month warranty

Retail: $1,299.00
Price: $1,149.99
You Save: $149.01 (11.5%)
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    Item #: FFU4
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    The Bonsai 4' x 2' fan filter unit is the largest FFU Bonsai makes, with the widest clean-air work area in the lineup and enough airflow, up to 160 FPM, to pressurize a small clean room or grow space with HEPA-filtered air.

    Every Bonsai fan filter unit pairs a true H14 HEPA filter with a backward-curved aluminum blower, a washable magnetic pre-filter and a 20-gauge powder-coated steel housing. It plugs into a standard 120V outlet and sits on an ordinary table, since the housing is only 14" deep.

    • 4' x 2'Filter face
    • H14 HEPA99.995% at 0.3 micron
    • 160 FPMHigh speed
    • 88 lbWeight
    • 18 monthsWarranty

    Why growers choose a Bonsai FFU

    Cleanroom-grade air

    The H14 HEPA filter is rated 99.995% at 0.3 micron, the standard for ISO Class 5 (Class 100) clean air, in a microfiber pack held in an aluminum frame.

    Largest work area

    A 4' wide filter face handles high-volume agar pours, grain transfers and two-person work.

    Built to run

    An aluminum centrifugal blower instead of the plastic fans in many budget units, three speed settings, and a pre-filter you rinse clean so the HEPA lasts longer.

    What you can do with it

    Agar

    Pour plates and make clean transfers in filtered air.

    Inoculation

    Inoculate grain jars, spawn bags and substrate.

    Liquid culture

    Work with LC, clone tissue and load syringes.

    Clean rooms

    Pressurize a clean room or grow space with filtered air.

    Setting it up

    1Place it

    Set it on a sturdy table with the filter face toward your work area.

    2Plug it in

    Any grounded 110/120V outlet works. No special wiring.

    3Let it run

    Turn it on a few minutes before you start so the bench fills with filtered air.

    4Work upstream

    Keep open plates and jars between the filter and your hands. Don't reach over them.

    Compare Bonsai FFU sizes

    ModelFilter faceSize (W x H x D)WeightHigh / med / low
    2' x 2' FFU2' x 2'25" x 25" x 14"37 lb120 / 110 / 100 FPM
    3' x 2' FFU3' x 2'38" x 26" x 14"67 lb120 / 110 / 100 FPM
    4' x 2' FFU (this unit)4' x 2'49" x 26" x 14"88 lb160 / 120 / 95 FPM

    Bonsai 4' x 2' FFU specs

    SpecDetail
    HEPA filterTrue H14, 99.995% at 0.3 micron; microfiber media in an aluminum frame
    Clean-air ratingISO Class 5 / Class 100
    Pre-filterWashable magnetic electrostatic, MERV 5 / G4 (95% at 5 micron)
    AirflowHigh 160, medium 120, low 95 FPM
    BlowerBackward-curved aluminum centrifugal, 3-speed
    Housing20-gauge powder-coated steel with pull handles
    PowerStandard 110/120V grounded plug; about 250W at 100 FPM
    NoiseAbout 50 to 60 dBA
    Resistance0.327 to 0.682 in. W.G.
    Size49" W x 26" H x 14" D
    Weight88 lb
    Warranty18-month limited warranty
    ShippingFreight on a pallet within the lower 48

    Filter planning. Rinse the magnetic pre-filter regularly and plan on a new HEPA filter about every 24 months for hobby use, or 12 to 18 months in a busy lab. An open agar plate test or a particle meter tells you when it's actually due.

    FFU basics

    Complete the setupStock your bench with pre-poured agar plates, sterile scalpels and sterilized spawn bags. Prefer a wood-cabinet laminar hood? Compare every option in flow hoods.

    Common questions

    Can an FFU replace a laminar flow hood?

    For most home growers, yes. It blows HEPA-filtered air across your work area for agar, liquid culture and inoculation, in a slimmer housing than a cabinet-style hood.

    What filter does it use?

    A true H14 HEPA filter rated 99.995% at 0.3 micron, which meets ISO Class 5 (Class 100) clean-air levels.

    Does it need special wiring?

    No. It plugs into any standard grounded 110/120V outlet.

    How loud is it?

    About 50 to 60 dBA, similar to a window air conditioner.

    How do I maintain it?

    Rinse the magnetic pre-filter now and then so it keeps catching larger particles, and replace the HEPA filter when an agar plate test or airflow check says it's due, typically every 12 to 24 months.

    What is the warranty and return policy?

    Bonsai FFUs have an 18-month limited warranty covering manufacturing defects under normal use. Unopened units can be returned; opened units are exchange only. We'll help with any shipping damage.

    Overall Customer Rating of 4 Reviews:
    review-star review-star review-star review-star review-star

    Everything I Hoped For!!!

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    Solid build, nice and quiet, and great customer service! Was able to get the unit to Alaska no issues! Huge upgrade for me! Thanks so much Midwest Grow!
    review image  

    MI

    Very Pleased

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    Unbeatable pricing and they even shipped it freight for FREE! Semi driver from FedEx was super cool, called to make sure I was home.
    The product i ordered works EXACTLY AS IT SHOULD. Been using it everyday for 7 days. 0% contamination rate.
    Thanks again MGK! Top notch in my opinion and I will order more stuff soon!
    Mush on 🍄

    CA

    Bonsai 4x2 Flowhood

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    Everything came on time and the flowhood was perfect. Unfortunately, the magnetic pre-filter was missing but customer service sent me the needed item right away. Overall, I am extremely satisfied with the product and service.

    What the Doctor Ordered!

    Rating:
    review-star review-star review-star review-star review-star
    Pros:
    Cons:
    Shipped next day and I received two days later Via FedEx Freight! Great service and the unit is flawless. I really like the custom stand and cover. I am replacing one I bought 3 years ago that did not have a metal cover or stand, very nice upgrade for me! Motor feels stronger and is much quieter too!

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