Bonsai FFU H14 99.995% HEPA Replacement Filter for 2'x2' Fan Filter Unit

This Bonsai 2' x 2' replacement HEPA filter is the genuine H14 filter for the Bonsai 2' x 2' Fan Filter Unit, rated 99.995% efficient at 0.3 microns for ISO Class 5 / Class 100 clean air.

Plan on replacing it about every 24 months for typical hobby use, or every 12–18 months in a busy lab. Swap it in when the filter reaches the end of its life or is damaged, and your FFU is back to full laminar flow for agar work, sterile transfers and tissue culture. It's a direct replacement — no special tools — and it ships free within the continental USA. This listing is the filter only; the fan filter unit is sold separately.

• True H14 HEPA
• 99.995% @ 0.3 µm
• ISO Class 5
• Direct replacement

• H14HEPA grade
• 99.995%@ 0.3 microns
• 2' x 2'Filter size
• ISO 5Class 100 air
• ~24 moHobby use

Why growers keep a spare filter

• Restores clean air – A fresh H14 filter brings your FFU back to 99.995% filtration at 0.3 microns.
• Keeps laminar flow even – The correct filter maintains the airflow balance the FFU was built around.
• Made for Bonsai FFUs – Sized for the Bonsai 2' x 2' Fan Filter Unit for a proper fit.
• Long service life – Plan on about 24 months of typical hobby use, and longer with very light use as long as it keeps passing your tests.
• No downtime – A spare on hand means a damaged filter never stops your lab work.

What's included

• One Bonsai 2' x 2' H14 HEPA replacement filter (fan filter unit sold separately)

How to replace the filter

1. Unplug the FFU. Disconnect power before opening the unit.
2. Remove the old filter. Take out the existing HEPA filter from the FFU housing.
3. Install the new filter. Set the replacement in place, oriented the same way as the original.
4. Check the seal. Make sure it sits flat and fully seated so no air bypasses the media.
5. Power on. Reassemble, switch the FFU on and let it run before you start work.

Specifications

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

• Shop fan filter units
• Flow hoods & clean room