NAC554.460. Duct systems in railway cars or vans.

     1. The intake side of the blower unit must be connected to the inside duct system by a 15-foot length of 6-inch flexible tubing coated with neoprene. Another 15-foot length of 8-inch tubing must be attached to the exhaust side of the blower and the other end inserted into a metal collar inserted into the paper grain door above the load.

     2. The inside probe and duct system must be constructed of flexible tubing coated with neoprene. Two similar systems must extend from the center to each end of the car or van and must be connected by a Y-section to a 5-foot section of 6-inch tubing which extends toward the door. The end of this section must be fitted with a sheet metal tubing that is 6 inches in diameter and extends through the paper grain door and connects to the intake side of the blower.

     3. A set of ten probes which are 6 feet long are required. Probes must be made from 1 1/4-inch I.D. hard-drawn aluminum tubing. Each probe must be fitted with a heavy sheet metal point having four slots which are one-sixteenth of an inch wide and 5 inches long through which air is taken into the duct system. Each probe must be attached to the duct system by a section of 1 1/2-inch flexible tubing.

     [Dep’t of Agriculture, No. 54.02-1 § II part subsec. B, eff. 4-2-71]