Compact HEPA air purifier
Tool-free filter changes, and no fingers near the fan.
- Process
- Printed prototype → Injection
- Quantity
- 500
- Region
- EU 230 V
- Environment
- Bedroom
- Image
- Concept image, not to scale
Example brief · not client workWe wrote this brief ourselves; it is not client work. The 3D model, drawings and inspection results are in production and will replace the placeholders below.
The request, as a client would send it
We're a small Berlin startup making a quiet bedroom air purifier for the EU market. The fan and electronics run in a cardboard mock-up; we need a real enclosure for 500 units. - A true HEPA H13 cartridge, 200 x 200 x 40 mm, that users replace every 6 to 12 months from the front, without tools. - A 120 x 120 x 25 mm DC fan (currently the Sunon EEC0251B3). - A 70 x 50 mm driver board with the 230 V to 12 V supply, and a capacitive touch panel on top (its board is 90 x 25 mm). Air comes in through the front, passes the filter and leaves through the top grille. Children sleep in these rooms, so fingers must not be able to reach the fan through the grille. For size, IKEA's UPPÅTVIND is the footprint people are used to, but it uses an EPA filter; ours needs a real HEPA cartridge and will be deeper. Please don't make it look like theirs. Our sketch is attached. We'll go for CE marking later, so please keep the IEC 60335 rules in mind.
Attached by the client
Links in the request
- Sunon DC fan catalogue (EEC0251B3) (opens in a new tab)120 x 120 x 25 mm, 12 V
- IKEA UPPÅTVIND (footprint reference) (opens in a new tab)28 x 22.5 x 12.5 cm, EPA12 filter; do not copy the look
Product names are their owners' trademarks and are used only to describe size or parts.
Highlighted numbers came with the request; they are the values we would design to.
What we considered
| No. | Consideration | How it is checked |
|---|---|---|
| 01 | Filter out the front, no tools The cartridge slides out toward the user through a front door with room to grip it. | Clear zone in the removal direction; the cartridge fits its bay with clearance. |
| 02 | A grille fingers can't get through Top grille openings sized so a 12 mm test finger can't reach the fan blades. | Grille opening size and depth to the blade tips. |
| 03 | A fan mount that doesn't hum Bosses sized for rubber isolation bushes between the fan and the housing. | Boss positions against the fan's hole pattern; wall thickness around them. |
| 04 | EU rules on the brief card The region gate adds IEC 60335 items to the brief card so they are reviewed, not assumed. | Listed on the brief card with their source. |
The question we would ask you
Magnetic front door or a latch?
Magnets need pockets and change the door's wall thickness; a latch needs a flex arm that must survive years of filter changes.
What we do not claim
- CADR or noise figures
- CE conformity
CAD, drawings and inspection
Model, drawings, parts list and inspection report
The 3D model, dimensioned drawings, parts list, and the first-try and final inspection results will appear here after the first build. First-try failures stay visible.