HVAC Filter Minder ® Indicator and Cabin Pressure Indicator

	HVAC Filter Minder ® Indicator The HVAC Filter Minder ® is a progressive or graduated indicator that monitors HVAC filters. As the filter restricts, the position indicator fills the window and locks at the highest filter restriction. The HVAC filter should be changed when the position indicator reaches the red zone.
	Cabin Pressure Indicator The Cabin Pressure Indicator is used to ensure that there is a positive pressure in the cabin. It uses a non-locking position indicator that floats up and down measuring the cabin pressure. The HVAC filter should be changed when the cabin cannot maintain the desired cabin pressure.