Air Quality Resources
Practical guides grounded in SHIELDGUARD engineering, independent test data, and peer-reviewed research.
Room Isolation vs Portable Purifiers
Why closing all inlets except one floor vent — and keeping the door shut — creates a closed circuit that portable purifiers cannot achieve.
Read more →HEPA MPPS & 0.3 µm Testing
Understanding Most Penetrating Particle Size and why independent test data at 0.3 µm matters for real-world protection.
Read more →UV-C 265 nm & Enclosed Chambers
Peer-reviewed evidence and NIST guidance on enclosed UV-C pathogen inactivation — without UV leakage into living spaces.
Read more →Senior Care & Multi-Floor Buildings
How shared building air dynamics spread pathogens between floors — and why positive-pressure room isolation was developed during COVID.
Read more →