Patent ID: 7819987

Claim:
An antigen exposure chamber, comprising: a cleaning water supply device for supplying cleaning water for cleaning the antigen exposure chamber; a cleaning nozzle connected to the cleaning water supply device and arranged to jet the cleaning water supplied from the cleaning water supply device, into the antigen exposure chamber and a duct of a fan unit to clean the antigen exposure chamber and the duct; a floor surface of the antigen exposure chamber; and an exhaust device provided below the floor surface to exhaust air from the floor surface of the antigen exposure chamber and collect and drain the cleaning water during cleaning, wherein the floor surface is made up of a plurality of porous plate floors arranged side by side, and the exhaust device includes: an air exhaust port disposed below the porous plate floors to exhaust air from the antigen exposure chamber; drain pans disposed so as to surround the air exhaust port and receive and collect the cleaning water flowing down from the antigen exposure chamber; a drain tank connected to the drain pans to store the cleaning water collected by the drain pans; a drain pump connected to the drain tank to drain the cleaning water stored in the drain tank into a drain pipe; a drying exhaust-air fan connected to the drain tank and arranged to exhaust air from the antigen exposure chamber through the drain tank to accelerate drying in the antigen exposure chamber after the cleaning water is drained; and an odor backflow preventing exhaust-air fan connected to the drain tank and arranged to exhaust air from the drain tank to prevent backflow of odor in the drain tank during exposure to an antigen in the antigen exposure chamber.