THM90 is a flat, aluminum flap air vent, equipped with a thermal break, intended for aluminum, wood and PVC windows. The THM90 diffuser is a new, improved version of the TH90 diffuser. The built-in wind flap guarantees high resistance to water penetration even in the open position. The use of a perforated external profile provides protection against insects, and the simplicity of construction makes it easier to keep clean. This air vent can be mounted either under the glazing unit (PB version) or between profiles (TR version), which allows it to be used as air supply for winter gardens.