Preventative maintenance on (2) Evcon high efficiency gas furnaces. Humidifier service (bypass manual style) on both systems. #35 water panels changed and drains tested. Filter replacement on both systems supplied by Chud. Checked all heating components to verify proper amperage and combustion levels. Verified intake/exhaust pipes are clear and free of debris. Both systems are operating properly and ready for the season. Attic Unit-Evcon M#RGF19100CP16MP11A, S#W1D8753998. Filter size-MERV 11, 20x25x4 spring and fall. #35 panel fall only. Main house unit-Evcon M#RGF19080CP16MP11A, S#W1L7196408. Filter size-16x25x1 spring and fall. #35 panel fall only.