These diffusers have fixed and straight blades. For supply air purposes, they are characteristically suitable for horizontal air throws. These diffusers are recommended for use with ceiling heights up to 4 m., with a supply air temperature difference of (+/-) 10ºC.The diffuser is made of a frame and a central blade block. The blade block is fixed to the frame by the aid of spring pins and can easly be removed / installed. The standard sizes start from 150 x 150 mm, and go up to 600 x 600 mm with increments of 75 mm. One, two, three and four way throwing types are available.