A diffuser is a ventilation grille equipped with additional elements: impellers, blades, partitions. Thanks to them, using a diffuser it is very easy to control air flows and adjust them to the requirements for a particular room. The ventilation grille simply covers the ventilation hole in the wall and minimally dissipates air masses. Both elements increase the intensity of air flow to the air conditioner, but in the case of diffusers, the flow is carried out more smoothly.