Abstract: The invention relates to a cuboidal housing for components of a HVAC system. The housing has at least one air inlet, at least one air outlet and a frame. The frame consists of twelve segments which form edge lines. The segments span six open side surfaces in a sealing manner with the open side surface of an adjacent housing, and an insulating means is located between the inner wall and the outer wall. Each panel element has a plastic profile wherein the profile has two bearing limbs each having a bearing surface. In the fitted state, the bearing surface of one bearing limb is in contact with the outer side of the frame segment directly or via at least one further component. In the fitted state, the bearing surface of the other bearing limb faces that side of the frame segment which is facing in the direction of the interior.

Abstract: The invention is a butterfly valve for a flow duct of an air-conditioning installation. The butterfly valve comprises two butterfly valve faces and is mounted for rotation about an axis. A device with at least two measurement points for determining the volume flow rate of a gaseous medium flowing in the flow duct is provided. In order to specify a butterfly valve, for example for a volume flow rate controller, which can determine a high differential pressure, even at very low volume flow rates, the butterfly valve comprises at least one hollow chamber on each of its two butterfly valve faces. Each hollow chamber has at least one recess, preferably with a multiplicity of recesses formed in the manner of a perforation. One measurement point is associated with one hollow chamber and the other measurement point is associated with the other hollow chamber.