iO HVAC Controls MUA-06 Make-Up Air Damper Kit 6"iO HVAC Controls MUA 06 ACTUATORS ARE INSTALLED ON 2ND DIMENSION Make Up Air Damper Kit 6" The Make Up Air Damper Kit comes with an adjustable static pressure sensor that allows the contractor to calibrate when the make up air damper opens eliminating excessive unconditioned air in the home. The make up air damper safely equalizes pressure within the home keeping unwanted and harmful gases from entering the living space due to negative pressure caused