Inspect unit interior at beginning of each heating and cooling season and as operating conditions require. Remove unit side panels and/or open doors for access to unit interior
FLUE GAS PASSAGEWAYS
ROUND TUBE PLATE FIN COIL MAINTENANCE AND CLEANING RECOMMENDATIONS
Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will greatly increase the life of the coil and extend the life of the unit. The following maintenance and cleaning procedures are recommended as part of the routine maintenance activities to extend the life of the coil.
Remove Surface Loaded Fibers
Source: MaintainX (Community Member)