Specifications include, but are not limited to: Requirements for the annual cleaning and preventive maintenance of the boilers/furnaces shall be per manufacturer’s requirements and shall include, but not be limited to, brushing out the boilers and smoke pipes, and cleaning passageways, sealing up with furnace cement or high temperature silicone when completed. Natural gas or propane boilers and furnaces cleanings and inspections are required for heat exchangers, burners, condensate traps and vents. Some systems will require additional inspection and service if not functioning properly. Those items will be listed below. Hybrids heaters will require coil flushes and filter changes. The cleaning service shall include replacement of the oil filter or filters, pump strainer and nozzles. When replacing the nozzles, check electrodes (replace if cracked porcelain or burnt electrode tips). Oil the circulator pumps and check couplings for proper operation. Air filters shall be replaced on all furnaces. When completed, all relief valves and controls shall be checked to allow for safe operation. With steam boilers, all low water cutoffs must be disassembled, cleaned and float checked for proper operation. On feedwater/condensate tanks, check float and condensate pumps for proper operation.