Patent ID: 8101893

Claim:
A vestibule abutting a source of radiating wave energy to form a drying apparatus, wherein the vestibule encloses an opening formed in the radiating wave energy source, the vestibule comprising: a choke section abutting the radiating energy source and comprising a first choke section opening aligned with an opening formed in the radiating energy source and a second choke section opening defined opposite the first choke section opening; a trap section abutting the choke section and comprising a first trap section opening aligned with the second choke section opening and a second trap section opening defined opposite the first trap section opening; and a paddlewheel section abutting the trap section and comprising a first paddlewheel section opening aligned with the second trap section opening, a second paddlewheel section opening defined opposite the first paddlewheel section opening, and at least two pairs of paddlewheels arranged in series between the first and second paddlewheel section openings, wherein a first pair of paddlewheels rotate out of phase with a second pair of paddlewheels to maintain the first paddlewheel section opening is always closed relative to an ambient atmosphere located outside of the second paddlewheel section opening.