How can fire residue affect HVAC systems and ductwork?

HVAC systems are often overlooked after a fire, yet they’re one of the main ways contamination spreads. Fine soot, ash, and smoke particles get drawn into ducts and filters, where they can accumulate and continuously circulate.

This not only reduces air quality but can also corrode metal components and spread odour throughout the building. In severe cases, residues form sticky deposits that attract dust and moisture, leading to mould growth inside ducts.

Professional cleaning and post-clean verification sampling are strongly advised before restarting any HVAC systems following a fire.