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42 Maintenance <br /> 3. Loosen the 8 screws holding the exhaust duct cover in place (11/32" nutdriver). Remove the exhaust <br /> duct cover by sliding it up and off the studs (the gasket will remain in place). <br /> 4. Clean the exhaust blower with a bottle brush or vacuum. <br /> NOTE: Take care to prevent damaging the combustion blower impellers. <br /> LA 1116_ <br /> f <br /> ©Travis Industries 4070806 100-01191000 <br />