The Illinois Fire Marshal is now using the 2021 edition of NFPA 96.

If you can smell what people are cooking from the hallway, something may be wrong.

Balancing filter efficiency with energy efficiency and fresh air circulation is a tradeoff.

Leakage of 12,824 CFM was causing multiple problems which sealing the leaks solved.

The loose wire and puddle on the floor don’t know – or care – about your mask or vaccine.