Assertion: duct | /r/HasProperty | clean
Facets:
value: per the nadca standard
type: OTHER
Source sentences:
text: A duct with less than 0.75 mg/100m2 is considered to be clean, per the NADCA standard.
text: If you find a sudden increase in allergy symptoms in the home from dropping of insects or vermin’s dander, it is time that the duct needs to be cleaned.
text: After all, if your ducts are clean, all that air flowing out of your vents should come out clean too, right?
text: Why do I get sewage smell when AC is on but not when Heater is on... ducts are clean.