ANSI Standards NSF ANSI 170-2017 pdf free download – Glossary of Food Equipment Terminology NSF ANSI 170-2017 pdf free download - Glossary of Food Equipment Terminology. 3 Definitions 3.1 accessible: Manufactured to be exposed for cleaning and inspection with the use of simple tools. 3.2 air gap: The unobstructed vertical distance... 02-19 Download Now