Patent ID: 7361082

Claim:
An air supply unit for providing conditioned air to a patient lying in a bed, comprising: a booster fan, arranged to force air through a guiding slot diffuser for guiding an airstream in a certain direction, said diffuser having two slots, and one area of perforated sheet, being arranged at an outlet side of said diffuser, where the area of perforated sheet is arranged in close proximity of the slots such that an airstream of air passing through both of the perforated sheet and the diffuser slots assumes a direction as controlled by the direction of the diffuser slots, and the diffuser slots form an angle α to a base plane of said supply unit such that air is guided obliquely down towards the patient, and wherein the at least two slots of the slot diffuser are arranged proximate to each other, and two main diffusers are provided and are arranged with the two main diffusers separately and opposingly disposed at two sides of the proximately arranged slot diffusers, and wherein each slot has a length, a width and a depth, wherein the depth is substantially larger than the width, and wherein the depth is ten to twenty times larger than the width and, wherein the width is approximately 2 mm.