Abstract: Devices for effecting a patterned, non-turbulent, non-aspirating flow of air or other gaseous fluid into a room or other confined area or enclosure of finite vertical and horizontal dimensions. These devices have a perforate outlet member and vanes for directing the gas in a controlled manner through the perforations in the outlet member. The vanes, the configuration of the outlet member, and the size and total volume of the perforations are selected to match the pattern in which the gaseous fluid is delivered to the user's requirements. Adjustable vanes may be provided so that the pattern of the air delivered by the device can be changed without altering the size or location of the vanes, the size or configuration of the outlet member, or the size or total volume of the perforations.