Rhino - Pro Filter 765m³

Carbon filter of 765 m³/h with a 200 mm flange and a height of 400 mm. RC412 carbon in a 50 mm bed, washable dust sleeve included.

What 1050 m² per gram means

This carbon is rated at an active surface of 1050 square metres per gram. The figure sounds impossible and it is the most interesting thing there is to say about activated carbon.

Activated carbon is treated until it is riddled inside with a network of pores, down to molecular scale. Every one of those pore walls counts as surface. A single gram, roughly a teaspoon, therefore has an internal surface on the order of a fifth of a football pitch. A filter holding two kilos of carbon reaches a surface you would express in square kilometres.

That is necessary because adsorption is a surface process. Odour molecules are not sucked up the way a sponge takes water; they stick to a wall they happen to pass. More wall means more room, and the longer it takes before everything is occupied.

It also explains why a spent filter looks exactly like a new one. Everything happens inside those pores, and nothing changes on the outside.

The dust sleeve around it protects precisely this. Dust landing on the carbon closes off pore mouths, and then the surface is still there but the air can no longer reach it. The sleeve is washable, so you take it off now and then rather than replacing it.

Technical Specifications:

• Carbon type: RC412, Australian
• Active surface: 1050 m² per gram
• Bed depth: 50 mm
• Flow: 765 m³/h
• Flange size: 200 mm
• Height: 400 mm
• Extra: machine-washable dust sleeve

Frequently asked questions

Can the carbon be cleaned?
No. The pores fill up and that cannot be undone by washing or drying.

How often do I wash the sleeve?
As soon as it looks dusty. A clogged sleeve costs you airflow.

Why a 200 mm flange?
At 765 m³/h a smaller connection would throttle the air too much.