Easing filter-maintenance chores, CleanAlert’s Wi-Fi enabled FILTERSCAN air filter monitor measures differential pressure changes in HVAC systems and notifies personnel via local, text and e-mail alerts when a filter needs servicing. Using patented differential pressure methods to actively gauge filter status, the monitor installs easily and is compatible with a wide range of air filters. It is also compatible with most residential, commercial, and industrial systems including units with single or multi-speed blowers and most variable-air-volume systems. Measuring 6 in. x 4.625 in. x 1.5 in., the unit includes an audible beeper and a green-yellow-red LED Status light and recalibrates after filter servicing. An optional wired output provides signaling to a remote building automation system controller.