You are bidding on a retrofit heat exchanger in a stainless steel housing -Equipped with Blauberg/Zern plastic exchanger (more efficiency due to deeper profiling) Surcharge 199,- countercurrent exchanger from Blauberg/Zern/Recair 366x366x300 even better efficiency. -optimal efficiency at 300m³ (our exchanger alone: 75% at 300m³ according to din ) -For an existing system with an efficiency of 60%, this is increased to 90%. -Sound reduction by an additional 22dB(A) (measured in the pipe) - Diameter of the connections optionally 125,150, 160, 180mm, (others on request) - We create a free certified calculation based on your information Development, construction, assembly of ventilation devices (central and decentralized) Also large devices for fitness studios, offices, sales rooms.