Oh to add, on the “intermittent fan” issue. Here’s Claude on how frequently HVAC systems turn over all the air in a building (and so would sanitize all the building air with UV in ductwork):
Key Variable: Air Changes per Hour (ACH)
HVAC systems are typically sized and rated in ACH — how many times per hour the system moves a volume of air equal to the total space it serves.
Oh to add, on the “intermittent fan” issue. Here’s Claude on how frequently HVAC systems turn over all the air in a building (and so would sanitize all the building air with UV in ductwork):
Key Variable: Air Changes per Hour (ACH)
HVAC systems are typically sized and rated in ACH — how many times per hour the system moves a volume of air equal to the total space it serves.
Typical ACH Ranges