Section 554.450 - Air circulation systems in railway cars or vans1. Each loaded railway car or trucking van must be prepared so that air can be withdrawn from beneath the grain and returned to the space above the load. This must be provided by a system of probes inserted in the grain and connected by flexible tubing to a portable blower outside of the car which returns the air to the space above the load.2. The probe system must consist of ten probes 6 feet long inserted equidistant in a line down the center of the car so that the perforated tips are near the floor.3. The probes must be connected by flexible tubing proportioned so that there is equal suction on each probe.4. One doorway must be sealed with gastight laminated paper. The ducts must lead through this seal to the portable blower.5. The blower must have a capacity of at least 625 cubic feet per minute against a 5-inch static pressure and must be of a design that can be made gastight. The gas may be introduced as a spray or through a volatilizer into the exhaust duct at any point between the blower and the car or van, or may be introduced directly into the space above the load.Nev. Admin. Code § 554.450
Dep't of Agriculture, No. 54.02 -1 § II part subsec. B, eff. 4-2-71