Ventilation chamber by a kind of K&N air filter: Does that do anything?

Hello, I drive a CRX TARGA EG2 and have seen with some others that you have an open air filter, with new aluminum intake tube. From this intake tube always goes a small hose to the Ventieldekell and at this ventieldekell opening I have seen with some just fals an open air filter. What does this bring, is it just to look? Or does this really bring something? Because if this is to be for the ventiel chamber to be ventilated, then I leave the hose dra nn, because when the throttle flap opens, then the engine is airy itself and vents the chamber over the hose at the Vetieldekell!? Or not? I added a picture. I mean the filter at the upper edge of the valve handle above the lettering VTEC.