ASHRAE 55-2017 Addenda c

Addenda c to Standard 55-2017 — Thermal Environmental Conditions for Human Occupancy (ANSI/ASHRAE Approved)
Amendment by ASHRAE, 2020

ASHRAE 52.2-2017 Addendum b

Addendum b to Standard 52.2-2017 — Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size (ANSI approved)
Amendment by ASHRAE, 2020