Why HVAC matters in drug remediation
Forced-air systems pull air from every room, pass it through the air handler and push it back out. When drugs are smoked or produced indoors, residue collects on return grilles, inside ductwork, on the blower and coil, and in filters, and the system then redistributes it. A house can be washed room by room and still fail clearance if the HVAC system wasn't addressed. That's why state cleanup standards and EPA guidance treat ventilation as a core part of drug-lab remediation.
What we evaluate
- Return and supply grilles and registers
- Accessible duct runs, including flex duct, which is hard to clean
- Air handler cabinet, blower assembly and evaporator coil
- Filters and filter racks
- Window units, PTACs and mini-split heads
Remediation options
- Sampling of HVAC surfaces as part of pre-remediation assessment.
- Component decisions. Rigid metal ductwork can often be cleaned. Flexible duct and duct board are usually replaced. Coils and blowers are cleaned, or the equipment is replaced when cleaning isn't practical.
- Cleaning by mechanical and wet methods appropriate to each component, with the system off and contained so residue isn't spread.
- Filter replacement and sealing of openings.
- Clearance sampling of HVAC surfaces with the rest of the property.
Coordination with HVAC contractors
Replacing equipment or ductwork may involve a licensed HVAC contractor. We plan the sequence so new equipment isn't installed into a contaminated system and so repairs don't recontaminate cleaned areas.
Do it at the right time
Run the system as little as possible before remediation. When remediation is underway, the HVAC system is shut down and isolated until cleaning is complete.
Common questions
Can duct cleaning companies handle this?
Standard duct cleaning isn't designed for drug residue and doesn't include sampling or clearance. It should be part of a planned remediation.
Do you always replace ductwork?
No. Rigid metal duct can often be decontaminated. Flexible and fiberglass duct are commonly replaced.