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Description
bonsai tree air purifier Bonsai HEPA FFU Flow Hood Filter UnitMore clean air workspace than a 22 FFU, with the same compact 14" deep design. The Bonsai 3' 2' HEPA Fan Filter Unit (FFU) is a mid sized, cleanroom grade fan filter unit for mushroom cultivation and sterile lab work an affordable alternative to a full laminar flow hood, sized for mycology labs, agar work, sterile transfers, classrooms, and small production spaces. With a larger filter face than a standard 22 model, this FFU gives you more usable
More clean-air workspace than a 2×2 FFU, with the same compact 14" deep design.
The Bonsai 3' × 2' HEPA Fan Filter Unit (FFU) is a mid-sized, cleanroom-grade fan filter unit for mushroom cultivation and sterile lab work — an affordable alternative to a full laminar flow hood, sized for mycology labs, agar work, sterile transfers, classrooms, and small production spaces.
With a larger filter face than a standard 2×2 model, this FFU gives you more usable clean-air workspace while still fitting on standard worktables and benches. It's ideal for growers who need extra room for grain transfers, agar workflows, liquid culture, and inoculation without stepping up to a full 4×2 unit.
Unlike many lower-cost FFUs that use thin housings and plastic blower assemblies, every Bonsai FFU is built with upgraded premium components for smoother airflow, quieter operation, improved durability, and longer service life.
FFU or full laminar flow hood? For most home growers, this FFU works as a complete flow hood solution. To compare both options before you buy, read our Laminar Flow Hood vs FFU guide — we built and tested both to show exactly where each one shines.
Why Growers Choose the Bonsai 3×2 FFU
- Larger 3' × 2' Work Area – More clean-air space than a 2×2 FFU for higher-throughput sterile work
- True H14 HEPA Filtration – 99.995% efficiency at 0.3 microns for ISO Class 5 / Class 100 clean-air performance
- Compact 14" Deep Housing – Fits on standard stainless tables, lab benches, and workstations
- Upgraded Aluminum Centrifugal Fan – Backward-curved aluminum blower for smoother airflow and longer service life
- Washable Magnetic Pre-Filter – Reusable electrostatic pre-filter helps extend HEPA filter lifespan
- Quiet, Efficient Operation – Designed for extended lab sessions without excessive noise
- 18-Month Warranty – Backed by extended warranty protection for added confidence
What You Can Do With This FFU
- Pour and transfer agar plates in a wider clean-air zone
- Perform grain-to-grain transfers and larger spawn workflows
- Inoculate grain jars, spawn bags, and substrates
- Handle liquid culture, cloning, and syringe prep
- Build a dedicated clean-air workstation on standard tables or benches
- Upgrade from a still air box to true HEPA-filtered laminar airflow
Technical Specifications
HEPA Filtration System
| Component | Specification |
|---|---|
| HEPA Filter | True H14 — 99.995% efficiency at 0.3 microns |
| Clean-Air Rating | ISO Class 5 / Class 100 |
| Filter Media | High-efficiency microfiber in a durable aluminum alloy frame |
| Pre-Filter | Washable magnetic electrostatic pre-filter (MERV 5 / G4, 95% at 5µm) |
Airflow & Performance
| Setting | Airflow |
|---|---|
| Fan Control | 3-speed adjustable |
| High Speed | 120 FPM |
| Medium Speed | 110 FPM |
| Low Speed | 100 FPM |
| Average Airflow | 500–530 CFM |
| Average Velocity | 100–120 FPM |
Motor & Construction
- Backward-curved aluminum centrifugal blower for smoother airflow and durability
- 20-gauge powder-coated housing with commercial-grade construction
- Integrated pull handles for easier positioning
- Standard 110/120V grounded plug — no special wiring required
Noise & Power Efficiency
| Metric | Rating |
|---|---|
| Noise Level | Approximately 50–60 dBA (comparable to a window AC unit) |
| Power Consumption | Approximately 250W at 100 FPM |
Dimensions & Weight
| Measurement | Value |
|---|---|
| Dimensions | 38" W × 26" H × 14" D |
| Weight | 67 lbs |
| Resistance | 0.327–0.682 IWG |
Washable Magnetic Pre-Filter
The included reusable electrostatic pre-filter captures larger airborne particles before they reach the HEPA filter, maximizing filter lifespan and reducing maintenance costs. Unlike the disposable pre-filters found on lower-end FFUs, the Bonsai magnetic pre-filter is washable, reusable, and designed for long-term use.
Who This FFU Is Best For
- Growers upgrading from a still air box to active clean-air equipment
- High-volume agar, liquid culture, and transfer workflows
- Home labs, classrooms, and small production spaces
- Anyone needing more working area than a 2×2 FFU without moving up to a full 4×2 unit
Replacement Filters
HEPA filters are consumables that gradually load with particulates over time. A replacement H14 HEPA filter for the 3×2 FFU is available so you can keep a spare on hand. The washable magnetic pre-filter extends the main HEPA filter's life by catching larger particles first, so under normal use you'll replace filters far less often than with a standard FFU.
18-Month Warranty
Every Bonsai FFU is backed by our 18-Month Limited Warranty, covering manufacturer defects and workmanship issues under normal use. Built with upgraded premium components and commercial-grade construction, the Bonsai 3×2 FFU is designed for years of reliable operation in mycology and laboratory environments.
Bonus Offer
Buy any Bonsai FFU or Flow Hood and save 50% on compatible accessories and replacement filters.
Accessories must be purchased at the same time for the discount to apply.
Shipping & Returns
- FREE shipping within the continental USA
- Unopened units eligible for return
- Opened units eligible for exchange only
- Shipping damage replacements handled promptly
Product Video
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
Stable, flexible in deployment configuration, creates true privacy and looks great.
Size: 3 Panel 12FT W
This is the second room divider panel I have installed, and there are several features about this one that I like much better than my older one.
The fact that there are no gaps and that the material is thicker means you get more privacy or more hiding power, if you wish. My older divider has vertical spaces between each of the panels and the panels are half as wide as the Siebwin panels, so there are many vertical spaces. The Siebwin divider really creates privacy.
Another feature that I really appreciate is that the legs are wider and stand off from the floor. On my older one the legs are flat and they're rather awkward to adjust because they create more drag on the floor. The feet on the older one also loosen if you turn them counter clockwise, so adjustments of configuration that require the feet to be moved are more complex.
The older divider also must be deployed in a zig-zag fashion because he feet are not as wide, but this new one can be deployed and stable in a straight, an "N" shape or an arc. They are both the same length, but because the older one must be use in a zig-zag deployment it doesn't reach to the length of the new one.
The Siebwin divider definitely costs more at $103.48, but it sports several features and advantages over the other brand, so it does a better job and is worth the extra cost.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Easy to assemble, does the job, material is shiny nylon and shows creases, minor defects, sloppy
Size: 3 Panel 12FT W, Size: 3 Panel 12FT W
The Siebwin room divider is a good idea, and for the price, it mostly delivers on the intended functionality. I ordered the 12 foot, 3-panel version mainly to hide an unfinished basement storage area that had become an eyesore. It works well for that purpose and gives the space a cleaner appearance without spending the kind of money that more decorative dividers or custom partitions cost. If you need something temporary, portable, or mainly functional, this is a viable option.
There are a few limitations that became obvious during setup and use. The first thing I noticed was that the weld quality on some of the metal poles is fairly sloppy. Once the cover is installed, you do not really see it, but up close, it does not look especially refined or professional. The blackout material also is not a matte canvas style fabric as I expected. It has more of a shiny nylon appearance, and the creases are fairly visible. Being that it’s more of a nylon, I’d be hesitant to try steaming it to remove the creases. However, the creases do not matter if you are using it in a basement, dorm, or shared room, but for photography, video work, or a professional office setting, the appearance could be disappointing. The fabric is thick enough, though. It blocks visibility well enough, but strong light behind it still shows through to some extent, nothing deal-breaking. Also, my fabric appeared to be slightly defective. The hook and loop strip on one of the bottom sections was off-center and couldn't be totally attached because it was lined up with one of the legs. I originally hoped to use this as a video backdrop, but I will probably end up replacing the fabric with a proper green screen or canvas material while continuing to use the frame itself. For now, it does a good job of covering my basement junk.
Assembly was actually easier than I expected and took roughly 15 to 20 minutes. The longer vertical poles are tethered together similarly to tent poles, which made setup straightforward and fairly intuitive. The shorter horizontal pieces slide and snap together to the top and bottom of the vertical assembly. After each section is assembled, the divider panels connect together with metal plates and two knurled screws (at the top and bottom), so no tools are really required. A few screws were difficult to start because paint had gotten into the threads, but once they caught, they tightened down normally. The feet install with similar knurled fasteners and help keep the divider reasonably stable. One thing to watch for during setup is the fabric orientation. There is one arrow indicator in the middle of the fabric to indicate up. However, if you need another indicator, the smaller hook and loop strip goes on the bottom while the longer strip goes on top. I realized mine was upside down right before finishing and had to redo it. I wasn't difficult to redo, despite the defect in mine.
The overall design is practical and easy to move around. I do like that the panels can fold and bend into different shapes depending on the space. The widened feet help stability, although when trying to stretch the fabric tight, I noticed the poles sometimes wanted to overlap slightly at the joints. Tightening everything helped somewhat, but it still happened occasionally. The divider feels adequate for normal indoor use, though I would not expect premium durability or luxury-level fit and finish at this price point. The entire device can also be easily disabled and stored in a tote if you need it completely out of the way. It comes with assembly instructions, but even if you didn’t have them, it’s easy to build without them (save a mistake or two).
In terms of value, I think the Siebwin divider mostly matches its price. Around $100 gets you a large freestanding partition with decent usability and easy assembly, but there are compromises in materials, appearance, and refinement. The defects are also off-putting, but hopefully you won't have them. Higher-end room dividers can easily cost two or three times more, so some of the tradeoffs are expected. I also noticed cheaper alternatives online, but based on the quality here, I suspect those would probably have even more issues. For practical home use, temporary privacy, hiding storage areas, or separating shared spaces, this is a good option as long as expectations stay realistic.
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Reviewed in the United States on May 18, 2026
★★★★★ 3
Works well but takes up more space than expected
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
This room divider does the job for creating a little extra privacy and was easy enough to set up. The panels feel decent quality and the wider feet help keep it more stable than some cheaper screens I’ve tried. My only issue is that it takes up a bit more room than I expected, especially with the feet sticking out. It’s still portable and folds away nicely, but definitely measure your space first. Overall it works well for separating a room or blocking off an area temporarily. i wish it came in other colors
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Nice divider, serves it's purpose well!
Size: 3 Panel 12FT W
This room divider worked out very well for what I needed. I wanted a simple way to create a little more privacy and separation in a larger room without doing anything permanent, and this divider was an easy solution. The panels provide good coverage, and the black color gives it a clean, modern appearance that blends in nicely with different décor styles.
Assembly was fairly straightforward, and once set up, the wider feet helped keep the divider stable on the floor. I was especially happy with how flexible the panels are to arrange. You can keep it mostly straight, angle it around furniture, or create a more enclosed private space depending on the layout you need.
The material allows light to filter through slightly while still offering a noticeable sense of privacy. I’ve used it for separating a workspace area, but it would also work well in bedrooms, apartments, dorms, studios, or shared living spaces. Another plus is that it can be folded and moved without too much effort when you want to change the setup.
Overall, this divider delivers a good balance of functionality, portability, and appearance. It’s a practical option for anyone needing temporary room separation without installing permanent walls or curtains.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Perfect for Adding Privacy to a Piano Studio
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
I Ordered the 2 Panel version which is way too big for my needs... that's on me. So keep in mind that the picture shows a fabric made for two panels only being used on one and hence it is not pulled tight; it would pull tight and not be so wrinkly if it was set up properly as two panels. The metal pools that make up the panels seem to be well made, stable, and of good quality. They were very easy to put together and they stand up tall with plenty of height. The appearance of it with the fabric on it isn't as elegant as it could be, but it still looks good enough. The material is plenty solid, not allowing light through it, and thereby making a solid barrier. I am using it to block the view out the studio door when a student is sitting at the piano to avoid distractions from the hallway. It will allow a student to enter the studio with our distracting the student who is at the piano.
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Reviewed in the United States on May 18, 2026