Round Air Filter Vents 0.22 Micron with 3M Backing (50-Pack)
Round Air Filter Vents 0.22 Micron with 3M Backing (50-Pack) is backordered and will ship as soon as it is back in stock.
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Description
Description
A sealed jar still needs to breathe. These Round Air Filter Vents let sterile gas exchange happen through a small hole in your lid, while the 0.22 micron membrane keeps airborne mold spores and bacteria out. Backed with lab-grade 3M adhesive rated to survive autoclave temperatures, they're built for grain jars, liquid culture lids, and spawn bags that need to be sterilized over and over.
- Filtration0.22 Micron
- Diameter19mm
- Adhesive3M Backing
- Autoclave Rated250°F / 15 PSI
- Pack Size50
Why Growers Choose These Vents
Colonizing mycelium needs oxygen in and CO2 out — without it, growth stalls and contaminants have an easier time taking hold. At 0.22 microns, these vents let that gas exchange happen while blocking mold spores and bacteria small enough to slip past looser filters. The 3M pharmaceutical-grade adhesive is rated to hold through autoclave cycles at 250°F and 15 PSI, so one sheet of 50 covers a lot of jars over a lot of sterilization runs.
What's in the Pack
- 50x round 0.22 micron air filter vents, 19mm diameter, 3M adhesive backing
Filter Vent Specifications
| Spec | Detail |
|---|---|
| Filtration Rating | 0.22 micron |
| Diameter | 19mm, fits a standard 1/4" hole |
| Adhesive | 3M pharmaceutical-grade backing |
| Autoclave Rating | Rated to 250°F at 15 PSI |
| Water Resistance | Waterproof |
| Reuse | Reusable, autoclave-safe |
| Compatible Surfaces | Metal or plastic lids, spawn bags |
| Pack Size | 50 vents |
| Best For | Grain jars, liquid culture lids, spawn bags |
How to Apply Your Filter Vents
- Drill or punch a 1/4" hole in your jar lid.
- Peel a vent from the sheet and center it over the hole, pressing firmly so the adhesive fully seals around the edge.
- Autoclave or pressure cook as normal — the vent and adhesive are rated to survive it.
- Add a self-healing injection port for a complete DIY sterile lid, ready for inoculation.
Frequently Asked Questions
What size hole do I need to drill?
A standard 1/4" hole fits these 19mm vents well. Center the vent over the hole so the adhesive seals fully around the edge.
Can these survive the autoclave?
Yes. They're rated to hold up through autoclave temperatures of 250°F at 15 PSI, and they're reusable across multiple sterilization cycles.
What's the difference between these and the Microppose lid filter stickers?
Both do the same job — sterile gas exchange through a drilled hole. These are 19mm at 0.22 micron in a 50-pack. The Microppose 18mm and 28mm filter stickers are a slightly coarser 0.3 micron rating in two size options. Any of them will work; pick whichever size matches the hole you're already drilling.
Do these work on spawn bags too, or just jar lids?
Both. The 3M adhesive bonds to plastic and metal lids as well as spawn bag film, so you can build your own filtered vent wherever you need one.
