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Abstract: The Pennsylvania State Mushroom Test Demonstration Facility has a combination of electronic and mechanical devices for automatically controlling the environment for mushroom production. The equipment is designed to provide the optimum temperature, humidity, fresh and recirculated air required in the various phases of production. Section one of the facility, housing the composting (Phase I) and filling area contains no filtering units and is at atmospheric pressure. Sections two and three of the facility make use of graduated pressure zones so that air tends to flow from the cleanest area, section two, to where mushrooms are being harvested, section three. These two sections also contain units which filter airborne contaminants larger than one micron. The air distribution systems for the Phase II, spawn growing, and production rooms are similar consisting of a central duct suspended from the ceiling with jets protruding along each side of the duct. Uniform air distribution within the room is based on the air entrainment principle induced by air exiting from narrow jets at rather high velocities. The number and size of the jets are determined by the volume of air flow and duct dimensions. The Phase II room is supplied with 1 cfm per sq ft of bed surface, the spawn growing room with 0.75 cfm and the production rooms with 0.3 cfm per sq ft of bed surface.
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