I wonder what GBCI considers to be "recirculated air"?
The language in the April 2021 v4.1 BD+C reference guide states "each ventilation system that suppies air to occupied spaces must have particle filters or air-cleaning devices that meet .... filtration requirements."
Curious if the following will be enforced to comply:
Fan-Powered VAVs that recirculate plenum air into the occupied space.
Ductless split systems.
Air curtains at loading dock doors.
Destratification fans, desktop plug-in fans, hand dryers in restrooms.
ALL units serving 'unoccupied' spaces.