The purpose of this ballot is to add a reference to non-back-pressure compensated readings used in a Direct Inflow Measurement (DIM) in Annex A, Annex B, and Annex F of NSF/ANSI 49, as well as to include language in Annex A, Annex E, and Annex F of NSF/ANSI 49 for the 12 inch clearance requirement used for measuring an exhaust HEPA filter. |