The Destructive Power of Gypsum Dust
Drywall sanding produces microscopic gypsum dust particles (1 to 5 microns) that are extraordinarily abrasive and alkaline. If sucked into a central heating system, gypsum dust coats wet evaporator coils like concrete and works into blower motor bearings, causing premature motor seizure.
Renovation Rule: Seal Return Grilles
During active drywall sanding, turn off your central HVAC system completely and cover all return air grilles with painter's plastic. Never use your central system to vacuum or ventilate construction debris.
About ClariSelect Editorial & Research Standards:
Sizing measurements, static pressure curves, and filtration ratings referenced across our educational guides are compiled from published ANSI/ASHRAE Standard 52.2 engineering data, AHAM AC-1 verified ratings, and manufacturer technical documentation. ClariSelect provides objective editorial research and analysis with zero sponsored placements.