At 02:18 hrs., Co.11 was dispateched to 1760 Castle Rock Rd. for a residental fire alarm. Upon arrival of E111, the homeowner advised C11 of oder of smoke. The crew from E111 investigated a reported back to C11 of haze of heavy smoke on the second floor. C11 then advised Frederick ECC of the situation and request a Box assignment, bringing A247 and R24 from Co.24. A247 arrived on scene and establised EMS. R24 arrived on scene and assisted E111 with ivestigating and smoke removal. Upon further ivestigation, it was determined to be a fan belt malfuction. C11 terminated command at 03:16 hrs.