Cat Carrier HEPA Filter

A screenshot from Autodesk Fusion of the 3d printed components of the cat carrier clearly showing how they mechanically interact. The main cowl connects the fans and filters. A central fin with dovetail block hold the filters on at the centre, and longer hooked clips hold the filters on the sides. There are countersunk holes for screws to attach to the fans. The Fan-Fabric Interface component was not used (due to time constraints).

Four fans are behind a screen, attached to a black 3-d printed cowl with filters on the back side, just visible between the fan blades. Four wires snake up the sides and meet at a black box at the top.

Four Noctua NF-A9 12V fans protected by screen, attached to cowl. Cables are clipped on with the filter clips. A Noctua NV-FH2 power distributor is at the top.

Two white HEPA filters are attached to a cowl below. Four wires snake up the sides and meeat at a black box at the top.

Flip side, showing the two Honeywell H-style HEPA filters.

Side view of the assembly, showing cables routed through an extension of the clips that hold the filters on.

Side view of the screen/fan/cowl/filter assembly.

The full filter assembly is placed at one end of the cat carrier. The HEPA filters are facing outward, and the halves of a side-release buckle are visible.

Mounted onto the cat carrier.

The filter is fully attached to the cat carrier with a sheer black fabric cover over the filter component. The power distribution box is visible lying on top of the carrier.

I sewed a sheer shroud to keep things tidy.

A side view from above of the cat carrier, showing the black shroud on the right and power distribution peeking out on the top.

Carrier as it would apper when in use.

A view from inside the carrier showing the fuzzy bottom, soft side and top, mesh side, and four fans blowing air directly at the camera from the far end.

Interior view.

A sheet of 6mil plastic was baste-sewn onto the side panel to encourage air flow in one direction: from the fans (filtered) to the other end which is open mesh. The baste-stitch makes the plastic easy to rip out just in case the fans fail, so the carrier can be returned to "factory settings".

The cat carrier side panel, with a Hello Kitty face cross-stitched onto it.

Personalized touch for the recipient: Hello Kitty cross-stitch in the lower corner of the long side panel.