Why is it essential to shut down and seal the HVAC system during lead abatement?

Shutting down and sealing the HVAC system during lead abatement is crucial primarily to prevent dust circulation. During lead abatement activities, lead-containing dust and particles can easily become airborne. If the HVAC system is operational, it can redistribute these harmful particles throughout the building, contaminating areas that were previously clean and exposing occupants and workers to lead hazards. By sealing the system, you effectively minimize the risk of lead dust spreading, thereby protecting health and safety during the remediation process. This containment measure plays a vital role in ensuring that the work environment remains controlled and reduces the potential for cross-contamination.