Section 460.20303. Vault and pit sealing, venting, and ventilation.

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In addition to the requirements contained in 49 C.F.R.§192.187(a)(3), which is adopted by reference in R 460.20606, an operator shall ensure that the outside end of the ventilation ducts of an underground vault or closed top pit is equipped with a suitable weatherproof fitting or vent head designed to prevent foreign matter from entering or obstructing the duct.

History: 1998-2000 AACS.

                    
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