Profile: Rickard Air Diffusion, Inc. exports variable air volume equipment and controls. We design variable air volume systems, variable geometry VAV linear diffusers, thermal variable volume linear diffusers and variable geometry pressure control dampers. Our variable air volume system provides a means of distributing conditioned air into the perimeter zones of a building, where the temperature control requirement is the most demanding. We supply thermal variable volume linear diffuser, which is a thermally powered VAV linear diffuser containing its own temperature sensing and volume control mechanism.