This is the small round foam filter that sits behind the dust bag at the motor inlet on a Eureka Mighty Mite, and it does far more work than its size suggests. It is the last barrier between the debris path and the motor. When a bag tears, splits at the seam, or blows out because it was overfilled, this filter is what keeps grit out of the windings.
It also matters when nothing has gone wrong. Foam loads up with the fine dust that gets past a full bag, and a loaded filter chokes airflow without making any noise about it. Suction drops gradually, the machine still runs, and most owners blame the bag. Changing the filter on a schedule alongside bags is the fix, and common guidance is every three to six months depending on how hard the machine works.
Mighty Mite owners are repeat buyers because the machines refuse to die. Vacuum forum members describe units kept at beach houses for a decade and older models still running after a few glued-back plastic pieces. Everything on them is serviceable and cheap, and this filter is the cheapest insurance in the box.
Fitment follows the bag type rather than a single model number. This filter is for Eureka Mighty Mite canisters and Sanitaire 3600-series units using Type N or Type MM bags, a roster that includes the 3620, 3681 and 3683 families. If your model is not one of those, check which bag it takes and we will confirm the match.
Built for
- Routine filter changes alongside bag changes on a Mighty Mite canister
- Restoring suction after a bag burst or a fine-dust event
- Protecting the motor after drywall dust, plaster or construction cleanup
- Salons, offices and cleaning crews running a Mighty Mite as a light-duty second machine
- Car interiors, stairs and hard floors, the jobs these canisters get kept around for
Specifications
- Type: open-cell foam motor filter disc
- Position: behind the dust bag, at the motor inlet
- Fits: Eureka Mighty Mite I, II and III and Sanitaire 3600-series canisters using Type N or Type MM bags
- Model families include the 3620, 3681 and 3683 series
- Replace-on-schedule consumable, commonly every 3 to 6 months depending on use
- Not a HEPA filter and not rated for a filtration efficiency percentage
Frequently asked questions
Is it washable or replace-only?
Treat it as a replacement item. Foam can be tapped out or rinsed and fully dried in a pinch, but the material breaks down and compacts over time, and a tired foam filter no longer seals or flows properly. Given the cost, replacing it is the better practice.
Where exactly does it go?
Behind the dust bag, at the motor inlet. Open the canister, remove the bag, and it seats in the recess in front of the motor housing. Fit it flat so nothing bypasses the edge.
Is this a HEPA filter?
No. It is a foam motor filter and it has no filtration efficiency rating. Some marketplace listings attach a 99.97 percent claim to parts like this one, and that is a HEPA specification that does not apply to open-cell foam. Its job is to protect the motor, not to polish exhaust air.
Will it fit my model number?
It fits Mighty Mite and Sanitaire 3600-series canisters that take Type N or Type MM bags. The 3620, 3681 and 3683 families are covered, along with many related model numbers. If yours is not listed, tell us the bag type your machine uses and we will confirm.
How often should I change it?
Every three to six months is the usual interval, sooner if the machine sees fine dust or if a bag has torn. A practical habit is to replace the filter every few bag changes, and immediately after any bag failure.
Discount Cleaning Products is an authorized dealer with US-based product support. Our staff works with this equipment every day and can confirm fitment against your model or motor tag before you order, so the part you receive is the part your machine actually takes.
