In a recent Q&A on the FacilityCare website, consultant Brad Keyes answered a question about dust on sprinkler heads.
Q: I just had a survey and received a finding for dust on some of the sprinkler heads. I understand that foreign material is not permitted, but minute amounts of dust??
A: Dust is a foreign material, and foreign material is not permitted on sprinkler heads. I support the finding, since how much dust is too much? If you allow just a little dust, then at what point is it too much dust? Besides, any foreign material, including dust, can change the reaction time of a sprinkler head.
Sustainability as a Baseline in Healthcare Facilities
Penobscot Valley Hospital Reports Data Security Incident
Ballad Health Acquires Land for Future Unicoi County Hospital
Why Healthcare Facilities Management Is Critical to Patient Safety 
Brookdale Senior Living Announces Acquisition of the Brookdale Galleria Community