6" Automatic Make-Up Air Damper(P)Providing make up air for exhaust devices is easy, controlling it is not until now. BROAN Directwire Make Up Air Dampers, when interlocked with slave dampers, open in unison to provide synchronized operation for kitchen, bath and whole house ventilation products. The MD6T is wired to the transformer, using low voltage wiring, which signals the damper to open and close while the range hood is in operation. The intelligent design options ensure