Under normal conditions when not undertaking flight operations Furious's furnace effluents exhausted through vents on either side on the flight deck well aft. During flight operations, the exhaust system was switched using valves to vents on the side of the hanger near the stern. What happened to the vents on the flight deck? Was there some kind of system that closed them off so that the wheels of aircraft landing did not become entangled?

Any information much appreciated.

Maurice