Bonsai 4 x 2 ft H14 99.995% HEPA Flowhood Fan Filter Unit (FFU) 120V
Bonsai 4 x 2 ft H14 99.995% HEPA Flowhood Fan Filter Unit (FFU) 120V is backordered and will ship as soon as it is back in stock.
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Description
Description
The Bonsai 4' × 2' HEPA Fan Filter Unit (FFU) is the largest unit in our FFU lineup — the widest clean-air work area we make, and enough airflow to pressurize a clean room or grow space with HEPA-filtered air.
It pushes air through a true H14 HEPA filter rated 99.995% at 0.3 microns for ISO Class 5 / Class 100 clean air. Every Bonsai FFU uses a backward-curved aluminum blower, a 20-gauge powder-coated housing and a washable magnetic pre-filter, and plugs into a standard 120V outlet.
- 4'×2'Filter face
- 99.995%@ 0.3 microns
- 160 FPMHigh speed
- 88 lbsWeight
- 18 monthsWarranty
Why growers pick Bonsai FFUs
- True H14 HEPA – Rated 99.995% efficiency at 0.3 microns for ISO Class 5 / Class 100 clean air.
- Largest work area – A 4' wide filter face — room for high-volume agar pours, grain transfers and inoculation.
- Aluminum blower – A backward-curved aluminum centrifugal wheel instead of the plastic blowers used in many low-cost FFUs.
- Washable pre-filter – The magnetic electrostatic pre-filter catches larger particles first and rinses clean, extending HEPA filter life.
- Compact 14" depth – Sits on a standard table or bench.
- 3-speed control – Set the airflow to match your technique and workload.
FFU or full laminar flow hood? For most home growers an FFU works as a complete flow hood solution. Our flow hood vs FFU guide compares both side by side.
What you can do with it
- Pour and transfer agar plates
- Inoculate grain jars, spawn bags and substrate
- Work with liquid culture, cloning and syringe prep
- Build a dedicated clean-air workstation
- Pressurize a clean room or grow space with HEPA-filtered air
- Upgrade from a still air box to HEPA-filtered airflow
How to set it up
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Place it. Set the FFU on a sturdy table or bench with the filter face toward your work area.
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Plug it in. Use a standard grounded 110/120V outlet — no special wiring.
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Let it run. Turn it on and let it run before you start so the work area fills with filtered air.
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Work in the airflow. Keep plates, jars and bags between the filter face and your hands, and don’t reach over open plates.
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Maintain it. Rinse the magnetic pre-filter periodically and keep a replacement HEPA filter on hand.
Compare Bonsai FFU sizes
| Model | Filter face | Dimensions | Weight | High / med / low |
|---|---|---|---|---|
| 2×2 FFU | 2' × 2' | 25" W × 25" H × 14" D | 37 lbs | 120 / 110 / 100 FPM |
| 3×2 FFU | 3' × 2' | 38" W × 26" H × 14" D | 67 lbs | 120 / 110 / 100 FPM |
| 4×2 FFU | 4' × 2' | 49" W × 26" H × 14" D | 88 lbs | 160 / 120 / 95 FPM |
Specifications
| Specification | Detail |
|---|---|
| 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 an aluminum frame |
| Pre-filter | Washable magnetic electrostatic pre-filter (MERV 5 / G4, 95% at 5µm) |
| Fan control | 3-speed adjustable |
| Airflow | High 160 FPM · Medium 120 FPM · Low 95 FPM |
| Blower | Backward-curved aluminum centrifugal |
| Housing | 20-gauge powder-coated, with pull handles |
| Power | Standard 110/120V grounded plug; approx. 250W at 100 FPM |
| Noise | Approx. 50–60 dBA |
| Resistance | 0.327–0.682 IWG |
| Dimensions | 49" W × 26" H × 14" D |
| Weight | 88 lbs |
| Warranty | 18-month limited warranty |
| Shipping | Free freight shipping within the continental USA, on a pallet |
Who it’s best for
- High-volume sterile work and production labs
- Commercial grow rooms and small facilities
- Clean room builds and room pressurization
- Anyone who wants the most working area in our FFU lineup
Keep a spare filterHEPA filters load up over time. The replacement H14 HEPA filter for this FFU drops right in.
See it in action
When to replace the HEPA filter
There's no single expiry date for a HEPA filter. It wears out two ways: dust loading, which tracks run hours and how clean your room is, and aging of the media and gasket seals, which tracks the calendar. Plan on about 24 months for typical hobby use and 12–18 months in a busy lab. Keep it in service as long as it passes an agar plate test and holds its airflow, and replace it sooner if it doesn't.
Our HEPA filter replacement guide explains each row of the chart and walks through four simple tests (agar plates, a flame test, an anemometer reading and a pre-filter check) that tell you when your filter is actually done.
FAQ
Can an FFU replace a laminar flow hood?
For most home growers, yes. It gives you HEPA-filtered airflow over your work area for agar, liquid culture and inoculation. Our flow hood vs FFU guide covers where each one fits best.
What HEPA filter does it use?
A true H14 HEPA filter rated 99.995% efficient at 0.3 microns, for ISO Class 5 / Class 100 clean air.
Does it need special wiring?
No. It plugs into a standard grounded 110/120V outlet.
How loud is it?
About 50–60 dBA, roughly like a window air conditioner.
How do I maintain it?
Rinse the washable magnetic pre-filter periodically. It catches larger particles so the HEPA filter lasts longer, and a replacement HEPA filter is available when you need one.
What is the warranty and return policy?
Every Bonsai FFU has an 18-month limited warranty covering manufacturer defects and workmanship under normal use. Unopened units can be returned; opened units are eligible for exchange only. Shipping damage is handled promptly.
How often should I replace the HEPA filter?
For typical hobby use, plan on replacing it about every 24 months; in a busy lab running most of the day, every 12–18 months; and in a dusty, round-the-clock space, every 6–12 months. Some manufacturers recommend replacing as often as every 12 months, because filter media and seals age even when the unit isn't running. Treat 24 months as a planning number, and let an agar plate test and an airflow check tell you when it's actually done. Our HEPA filter replacement guide has the full chart and four simple tests.
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