Bonsai 4 x 2 ft 99.99% HEPA Flowhood Fan Filter Unit (FFU) 120V
Bonsai 4 x 2 ft 99.99% HEPA Flowhood Fan Filter Unit (FFU) 120V is backordered and will ship as soon as it is back in stock.
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Bonsai 4 x 2 ft 99.99% HEPA Flowhood Fan Filter Unit (FFU) 120V
Description
Description
Commercial cleanroom performance in a compact 14" deep design.
The Bonsai 4' × 2' HEPA Fan Filter Unit (FFU) is our largest fan filter unit for mushroom cultivation and laboratory work — delivering professional ISO Class 5 / Class 100 laminar airflow for mycology labs, tissue culture, agar work, sterile transfers, and clean-air environments, all while keeping a compact footprint that fits on standard worktables.
Unlike many low-cost FFUs that use thin housings and plastic blower assemblies, every Bonsai FFU is engineered with upgraded premium components for smoother airflow, quieter operation, improved durability, and longer service life.
Designed for serious growers and laboratory professionals, this 4' × 2' FFU provides the largest sterile workspace in our FFU lineup while remaining manageable for home labs, commercial grow rooms, and dedicated clean-air workstations. It's also an excellent choice for clean room builds and room pressurization, where its higher airflow keeps a space flooded with HEPA-filtered air.
FFU or full laminar flow hood? This FFU works as a complete flow hood solution for most growers, and its larger filter face gives you more usable working area. 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 4×2 FFU
- True H14 HEPA Filtration – Certified 99.995% efficiency at 0.3 microns for ISO Class 5 / Class 100 clean-air performance
- Largest 4' × 2' Sterile Work Area – The most working room in our FFU lineup, perfect for agar pours, grain transfers, liquid culture, and high-volume inoculation
- Upgraded Aluminum Centrifugal Blower – Backward-curved aluminum fan for smoother airflow, longer lifespan, and quieter operation than plastic blower systems
- Compact 14" Deep Housing – Fits comfortably on standard stainless tables and workbenches despite the large filter face
- Washable Magnetic Pre-Filter – Reusable electrostatic pre-filter helps extend HEPA filter life and reduce maintenance costs
- Built for Long-Term Reliability – Durable powder-coated housing designed for commercial laboratory use
- 18-Month Warranty – Backed by an industry-leading warranty for added peace of mind
What You Can Do With This FFU
- Perform sterile agar pours and transfers across a wide clean-air zone
- Inoculate grain jars, spawn bags, and bulk substrate
- Handle liquid culture and cloning work
- Create a dedicated clean-air workstation for laboratory procedures
- Pressurize a clean room or grow space with HEPA-filtered air
- 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 | 160 FPM |
| Medium Speed | 120 FPM |
| Low Speed | 95 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 portability
- 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 | 49" W × 26" H × 14" D |
| Weight | 88 lbs |
| HEPA Resistance | 0.327–0.682 IWG @ ~525–530 CFM |
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 fully washable and designed for long-term reuse.
Who This FFU Is Best For
- Serious growers and laboratory professionals running high-volume sterile work
- Commercial grow rooms and small production facilities
- Clean room builds and grow-space pressurization
- Anyone who wants the maximum working area in our FFU lineup
Replacement Filters
HEPA filters are consumables that gradually load with particulates over time. A replacement H14 HEPA filter for the 4×2 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, these FFUs are designed for years of reliable operation in laboratory and mycology 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 freight shipping within the continental USA
- Shipped securely on a pallet for protection during transit
- Unopened units eligible for return
- Opened units eligible for exchange only
- Shipping damage replacements handled promptly
Product Video
Our Growing Experts Recommend
Products our growers commonly use with this item
Let customers speak for us
I was getting alot of contam with northspore boomr bag strait garbage company. Contamination central at northspore almost everything contams. I tried a couple other companies then tried this blackcow. Its black gold Texas T the biggest dummy in the world will get massive flushes with this. The grain bags are awesome too and sterilized right. I went 14/14 on the grain bags. Midwest know what they are doing and even the packaging is next lvl everything double bagged. I only buy from midwest it's worth every cent
It's been several days since the Ecosphere arrived and I set it up, and I'm still amazed at all I got for the price: heater, fan, humidifier, two plug-in timers, two foil trays, and, of course, the five-tier tent with shelves and the plastic cover. Oh, and the LED light strip and the round air filters. It's everything I need right now, and I've started the growing process. It's a crazy good deal for the price. I'm new to mushroom growing, and I'm thrilled that I bought this setup as a start. Just plain wonderful.
Fast and easy colonization! These grain jars showed growth after just 10 days. My previous efforts with the all-in-one bags are taking MUCH longer but also working. Thank you Midwest Grow Kits 🙏
I love the people and the products. The people at MWGK clearly care about the integrity of the community they serve.
The monotub works amazing only had it a couple of weeks and about to have second harvest I used AIO grow bag for first flush and move to tub for second and its great not having to watch 24/7. Thanks Midwest
Four days after mixing grain, Select substrate, and the Midwest horse manure booster - the results speak for themselves.
It has everything you need for a fast, large flush success with fewer moving parts than a standard monotub. It is a surprisingly versatile option for more advanced students. Pic is 5 grain jar at 8 days. GT LM This is where I shop, now.
Rich, perfectly field-wet, sterile and it is perfect for those many varieties that won’t thrive quite as well in Bulk Substrate and Casing Mix, which I’ve seen as best for psilocybes/cyanescens. I’m using it for the first time with Lions Mane and King Trumpets. So far so good, 7 days and primordial and pins are starting to flourish. It drains better and is lighter than MGK’s Bulk Casing and Substrate. Great product.
Love the heater and how even and exact it heats. I set mine to 76 degrees and my room fluctuates from 64-75 and it holds solid at 75 degrees. I used a probe thermometer to double check the substrate level temp and its exactly 1 degree less than the heater setting. Another tip, I only needed to use the round monotub thermometer to check my humidity levels every so often. I would leave a filter disk on that hole instead of the thermometer. The only time it came in handy was after my first flush when humidity started to drop. I was able to use that gauge and check whether I needed to mist. Overall great kit and worth the money!
Ive bought mutiple jars before i came up with my own recipe, every jar produced healthy cultures, even if ones damaged in shipping they replace immediately, highly recommend
Very small chance that you get a contaminate you already had it and you’re either culture spores etc. their stuff is 100% sterile every time 100% of the time everything is viable never had a problem been shopping with them for sometime
It’s very good product and I highly recommend it to everyone.👏👏👏
I love my magnetic stir plate it works great for Liquid culture jars.
My bag had a slow start, but excellent finish. Oak Ridge.
Great product for my cannabis best deal around arrived fast thank you Midwest grow kits definitely will be purchasing again
