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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
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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- 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 21 reviews
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Product Reviews
★★★★★ 5
Finally, a practical parenting book!
Format: Kindle
Prior to reading this book, I didn’t feel confident in my approach to discipline. I would read parenting advice from different sources and sway back and forth from one extreme to the other—overly strict to too lenient. The approach of grace based disciple is balanced. The author recognizes that children will act like children and we shouldn’t expect them all to act like little robots. However, they still need discipline (not punishment!) for their misbehavior. She gave very practical lists of what consequences work best at each age and for each personality type, and went beyond that to say how to truly address the deeper issues associated with the misbehavior.
If you are wondering about her view on spanking (because most authors take a very strong stance on this) I think this book is very beneficial no matter which camp you are in. In the appendix, the author addresses spanking in a nonjudgmental way. She gives cautions if you decide to use spanking, and gives cautions if you decide not to use it.
My only criticism of this book is that one chapter talks about how we need to recognize the “home country” (personality) of each member of our household and she suggests using an assessment to determine what “country” your child is from. However, you must pay separately for the assessment and it isn’t cheap. This idea of what “country” you and your children are from is referenced again and again in the book so I feel like it should have been included in the appendix. However, this book is still worth it. Don’t let that keep you from buying it.
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Reviewed in the United States on June 29, 2018
★★★★★ 3
Mixed feelings
Format: Paperback
I had the opportunity to finish this book in one day of reading, while my 3 kids spent the day with grandparents. It is a very easy read, very accessible. Karis' style is very informal and she employs a lot of humor (and hyperbole), and that may be refreshing for some, though I found it distracting. I hope my criticisms will not be taken too harshly, and am certainly glad that others have found it inspiring or enlightening! We desperately need more grace based parenting in our homes and churches as we strive to undo the influence and damage of the punitive methods that have marred the face of Christian culture for so long! We need more books like this, that can reach every believing parent where they are, and inspire them to parent with the same grace and wisdom our Heavenly Father employs!
All that said, this was my experience reading the book: I felt the numerous anecdotes take up valuable space and time that would be better spent digging into passages of the Word and working through practical application. I was disappointed to not find a whole lot of either. If you are well-read on child development and "alternative" methods of discipline and childrearing (from those considered to be in the "anti-spanking camp"), you will find nothing new here. I didn't care for the rebranding of the classic four temperments and promoting supplemental Family Matters products... You can easily find many free tools and information reguarding personality psychology on the internet, and you will have a much deeper understanding. But personality is a shifty thing in youth anyway, and if you are not inclined to pursue that kind of study, I promise that simply resolving to spend more unstructured time with your children, to slow down and observe them at work or play, to listen with full attention, considering their perspective before answering or judging, you will learn more than what could ever be summerized in a personality type. Pegging a child in any brand of personality typing has it's own drawbacks. It can promote unfair assumptions, lead to misunderstandings, and cause confusion when trying to understand more subtle or complex behaviors and attitudes.
I appreciate her reasoning for not digging into the spanking issue in the main content of the book, setting that aside in the appendix in the back. She does a good job highlighting what gracious spanking looks like if you choose to do so. I am of a similar opinion that it is not a crucial point of doctrine and isn't always an issue of abuse or neglect either. It truly is a parent's prerogative and responisibility to consider the Word and the research and their own consience on the matter. If you do spank, follow her guidelines and you will not go wrong! I did find her characterizations of non-spankers, like myself, a bit condescending ("lazy", "fearful"), but to be fair she is addressing the extreme. If only you knew how much effort and time in research and reflection many of us sacrifice to employ better methods! It is very proactive approach and it is difficult work! I think she could have done a better job to include an objective summery of arguments in both camps for better understanding, but I really appreciate her exhorting those in both camps to avoid contention and judgement. It should never be an issue that causes us to break fellowship with a brother or sister!
There is a good chapter on what she calls the "3 P's", a helpful framework for discerning the whole truth of God's word. But as far as parenting goes, personally, I didn't find anything new or particularly helpful here. I will be gifting this to a good friend/newer mom who will likely get more out of it than I did. Maybe you will too!
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Reviewed in the United States on July 24, 2018
★★★★★ 5
Excellent, succinct, intro to Marxism...
Format: Paperback
Richard Wolff’s Understanding Marxism is an excellent and highly accessible populist work that introduces Marx’s critique of the inherent contradictions and inevitable problems that plague – and will continue to plague – capitalism. So, he sets out to show how the contemporary experience and understanding of the relationship between employer-employee emerge from because it is the modern manifestation of the historical distinction, which is hierarchical, oppressive and ultimately “exploitative, between master-slave and Lord-serf - Zizek, in his small text The Relevance of the Communist Manifesto, offers a unique response to this line of critique and reasoning.
Above I mention the accessibility of the writing – in fact, there is a crystalline clarity to it - and if you have watched Wolff’s show or listened to his interviews, it’s as if Wolff is speaking in his usual manner that avoids academic jargon and communicates his ideas directly. This is an extremely helpful and useful guide to understanding Marx, and I am hoping many young intelligent politically-minded university students will read it – e.g., those who might be unfamiliar with Marx - because it offers a sensible corrective to the ill-informed Marxist critics on the so-called “intellectual dark web” (IDW) who repeatedly, without properly understanding Marx, scapegoat him and employ him as a bogeyman to enhance the arousal of fear and alarm with their rhetoric.
Ultimately, and here I agree with Wolff, Marx might be said – bound intimately with Marx’s notion of “species being” (a term Wolff avoids) – to show why “ending exploitation [is] necessary to actualize social commitments to liberty, equality, brotherhood, and democracy” (36-37). So, instead of a utopian (end-of-history) communist or socialist model for society, Wolff, through his reading of Marx, offers what might be termed a philosophical or even commonsensical (and achievable!) model of what a more socially aware and humanly grounded workplace might look like – one that is Marxist in nature and instantiates people coming together in more “democratic, egalitarian ways.” (71).
Wolff also directs readers to primary source material for further study - so, all the quotations included are traced to Marx's original writings, which readers are encouraged to seek out.
To conclude, readers must be aware that this pamphlet – indeed, this is what Wolff calls it – does not attempt to serve as a broad or sprawling introduction to Marx and his writings. Thus, when ordering it, be aware that it is not akin to academic introductions and critiques of Marx such as Peter Singer’s Marx: a Very Short Introduction (OUP) or Allen Wood’s Karl Marx (Routledge).
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Reviewed in the United States on May 20, 2019
★★★★★ 5
Excellent Essay
Format: Paperback
Wolff is a one of the best people I know of to deliver a quick handbook to Marx. He delivers a master class on this complicated subject and I have long respected his views on economics and politics.
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Reviewed in the United States on December 15, 2025
★★★★★ 5
Awesome Introduction. A quick, easy read.
Format: Paperback
Very good overview and a quick little read! I was able to read this in a day, despite having ADHD. That, in my opinion, is a testament to the engaging, straight-forward writing style. I now feel well-versed enough in thd basics to read more in-depth texts. Highly recommended.
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Reviewed in the United States on October 19, 2025