Four-Way square diffuser with removable core. The four-way square diffusers meet the functional and architectural requirements of modern updated locations. Its geometrical shape, fits perfectly in the style of the surroundings. The DBQ diffuser offers great flexibility of use, as it can provide a diffusion of air suitable to the type of surroundings. A characteristic of this sort of diffuser is its high level of induction rate. They can be used in premises up to 4 meters high and with a temperature differential up to 12ºC, obtaining good results, not only in air speed but also in sound pressure level in the comfort zone.