Guides

10 Sep 2026

PM2.5 is the mass of particles with an aerodynamic diameter of 2.5 micrometres or less, suspended in one cubic metre of air, reported in micrograms …

10 Sep 2026

MERV summarises how efficiently a filter removes particles across defined size ranges, tested under a standard method. A higher number indicates …

10 Sep 2026

Air changes per hour expresses the volume of air delivered to a space in an hour divided by the volume of the space. Six air changes per hour means a …