AIRFLOW FAQ
PC fans, filter access and smoke tests in printed purifiers
The questions makers ask first: can the fan be replaced, what does a smoke test prove, and why airflow should stay serviceable.
Ivo
Serious airflow for a real room. River's biggest mover of clean air, in a long horizontal shape that sits naturally on a sideboard or under a TV.
Fan + filterBuilt around PC fans with HEPA or activated carbon filter options for a compact desk or shelf purifier.
Printable frameThe printed body holds the fan and filter in a clean shape that is easy to place at home.
MaintenanceFan replacement and filter access stay part of the design, so the purifier remains usable over time.
Related guides
AIR PURIFIERS
Roy, Max, Yomi, Eno or Ivo: which River purifier should you choose?
A clear comparison of River purifier sizes and use cases, including why Max is compact despite the name and Eno is the largest.
Similar designs
Roy
A quiet, USB-powered air purifier that just does its job. Cleaner room air from a printed object that actually looks like it belongs on the shelf — no humming appliance, no exposed electronics.
Max
The fastest River purifier to build. Snap the printed shell onto a standard PC fan, drop in the HEPA, plug into USB — your room is already cleaner.
Yomi
A flat disc you barely notice. Real airflow, quiet operation, and a soft printed silhouette that disappears into a shelf or a coffee table.
Eno
HEPA and activated carbon in one tall, calm object. The only River purifier that removes both particles and odors — for kitchens, bedrooms and any room that smells of yesterday.
Also from River Family
Ice air coolers
Yuki
A full-size ice-pack air cooler built from printed parts, a quiet USB fan and a frozen water pack. Freeze the pack overnight, place it inside, and Yuki sends a steady cooler stream across the desk with very low power use.
Water filters
Jem
A polypropylene tap water filter for activated carbon. The flower-like top opens for filling, the body attaches to standard taps, and the bottom grid holds carbon while water passes through. Joined G-code keeps the water path cleaner by reducing micro-stringing.