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Pass-throughs typically consisting of four rigid, upright plastic or metallic sections connected at right angles and rotating around a central upright pivot. These pass-throughs are usually mounted either in a wall common to two contiguous rooms or on the floor. They permit access between two contiguous rooms preventing the passage of air, light, humidity, radiation, or other environmental agents. Revolving pass-throughs are typically used in healthcare facilities to pass specimens from a restroom to the clinical laboratory and to transfer x-ray film cassettes into and out of darkrooms.
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