What was found
(CAN) THE FLIGHT CREW ENCOUNTERED FUMES IN THE COCKPIT AFTER TAKEOFF. THERE WAS ALSO A POSSIBLE HAZE ASSOCIATED. THERE WERE SIMILAR FUMES REPORTED IN THE FWD & AFT CABIN. THE FLIGHT CREW DIVERTED BACK AND DID DECLARE AN EMERGENCY AND LANDED RUNWAY WITHOUT FURTHER INCIDENT. CARRIED OUT FIM 21-20-00-810-801A AND FIM 21-20-00-810-803A. NO FAULTS FOUND. REPLACED BOTH RECIRCULATION AIR FILTERS IAW AMM 21-24-02, PB 401. BOTH LT AND RT PACK INLETS INSPECTED. NO FAULTS FOUND.