what is purpose of channel from exhaust manifold cover with flipper in mazda carb engine air intake housing?

Question

mazda B3 carb, 1990

Answer 1

helps motor warm up faster and run smoother when cold,,,,flipper should shut off manifold heat to carb when warmed up... air should come through snorkel at that point

Answer 2

Called a hot air stove on the manifold and a thempature controled air intake when the choke is on warm air atomizes fuel better than cold air. You can't get those pleated paper and foil hoses any more. You might be able to adapt Volkswagon air pipes to work.