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Remove BLOWER BOLTS FIGURE 15 37 DO NOT OPERATE THE FURNACE WITHOUT AN AIR FILTER. Air Filter The filter should be inspected frequently and cleaned as necessary. We recommend a monthly inspection at first, perhaps coinciding with the arrival of the monthly fuel bill as a reminder. The frequency may be increased or decreased depending on experience and conditions. Lubrication Both the induced draft blower motor and circulating fan motor are ball bearing type motors. Neither requires routine lubri