6 Pages • Free A4 PDF
Buyer's guide
The Clean Air CADR & Purifier Guide
Size a HEPA purifier for two rooms with the two-thirds rule and five air changes an hour, a six-point label check, the MERV ladder for your furnace, and how to place and run the unit.
The Complete Daily System
Healthy Home Air Quality Audit (36 Pages)
Six room sheets that score themselves, purifier and fresh-air calculators, source-first fixes for particles, mold, chemicals, CO and radon, and a smoke-season clean-room plan.