Every River purifier is a printed shell, a USB-powered PC fan and one or two filter layers. The differences are real: fan size (120mm or 200mm), how many surfaces draw air in, whether activated carbon is in the mix, and how the fan attaches to the printed body. This is the practical comparison.
Roy — vertical 120mm, dual intake, ~60 m³/h. The clearest entry into the lineup. Air comes in from both the side cylinder surface (replaceable HEPA) and the bottom face (HEPA disc, loose activated carbon, a circular carbon filter, or any combination). Two parallel intake paths roughly double the effective filter area without increasing fan power, so a small 120mm fan moves a meaningful amount of clean air quietly. The right pick for a desk or a bedside table.
Max — 120mm, square HEPA, fastest build. Same 120mm fan as Roy, but the fan keeps its original square plastic frame: the printed shell clicks onto the frame instead of removing the frame and gluing onto the central hub (the technique used by Yomi, Eno and Yuki). Max is the easiest purifier in the lineup to assemble. Behind the fan, a flat 120×120mm HEPA — no circular cut required.
Yomi — squashed cylinder, 200mm, single rear HEPA, ~100 m³/h. Yomi jumps to a 200mm fan but uses only one circular HEPA filter behind it. Higher raw airflow than Roy thanks to the bigger fan, but the smaller intake surface means the fan has to work harder for the same effect — less efficient per watt and per dB. The win is compactness: the body is barely taller than the fan itself, a flat disc you can leave anywhere.
Ivo — horizontal 200mm, dual intake, ~200 m³/h. Yomi's bigger sibling: same 200mm fan but with Roy's dual-intake principle applied — HEPA on the side cylinder surfaces AND on the rear circular face. Highest airflow in the River line. The trade-off is size: Ivo is long because the fan sits horizontally inside it. Same total volume as Eno but laid on its side.
Eno — vertical 200mm, layered HEPA + activated carbon. The only River purifier built around a layered filter stack. Activated carbon (~2 cm thick) on the top face and around the upper cylinder, then the fan pushes air down through HEPA on the lower side surfaces — all enclosed in one printed shell. River's largest vertical purifier, and the one to pick if you want both particle filtration AND odor removal in a single object.
Ali, Evo, Haze — visual variants. Ali and Evo are stylistic remixes of the Roy/Yomi families with different silhouettes for different rooms. Haze is the plant-pot variant of Dome: a pointed shaft on the back so Haze sticks straight into a plant pot and blows filtered air up through the leaves.
How to pick in one line. Want the most efficient compact build? Roy. Want the simplest assembly? Max. Want maximum airflow on a horizontal surface? Ivo. Want HEPA + activated carbon in one object? Eno. Want a flat disc that disappears? Yomi. Want a plant ornament? Haze.
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.
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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.
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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.
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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.
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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.
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