Ultrasonic decontamination device

A method for decontaminating the interior of a biosafety cabinet, the method comprising:

• providing an exhaust HEPA filter in the interior of the biosafety cabinet;
• providing an interior duct within the interior of the biosafety cabinet;
• installing an ultrasonic atomizer, having a nozzle, for atomizing a peracetic acid disinfectant by ultrasonic vibration and releasing droplets, a diffusion fan, a temperature-humidity sensor, and a circulation fan in a work area of the biosafety cabinet, the diffusion fan being connected to the ultrasonic atomizer, wherein the diffusion fan is installed at a periphery of the nozzle of the ultrasonic atomizer;
• releasing droplets by activating the ultrasonic atomizer and atomizing the peracetic acid disinfectant by ultrasound, and gasifying the droplets;
• and
• circulating the gasified peracetic acid in the interior of the biosafety cabinet,
• providing the work area with a return inlet configured to return the circulated gasified peracetic acid into the work area and an outlet configured to convey the circulated gasified peracetic acid from the work area,
• wherein an impending flow of the peracetic acid gas at an exit of the interior duct is partially returned to the work area through the return inlet while at least a portion of the impending flow of the peracetic acid gas is exhausted to the outside via only the exhaust HEPA filter without being recirculated through the work area and at a position that is proximate the return inlet.