These diffusers have fixed and curved 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 mm diameter, and go up to 500 mm with increments of 50 mm.