The most frustrating part of fire recovery is the smell that won’t quit — gone for a day after cleaning, then back the moment it warms up or the air conditioning kicks on. That’s because smoke odor lives in the materials, not the air: it embeds in drywall, framing, insulation, upholstery, and especially HVAC ductwork. Spraying deodorizer masks it for a while, but lasting removal means addressing the source.

Where the smell hides

• HVAC & ductwork. The system circulated smoke during and after the fire; running it re-releases odor until it’s cleaned.
• Porous materials. Drywall, insulation, framing, carpet, and upholstery hold odor compounds deep in the material.
• Hidden cavities. Wall and attic spaces the smoke traveled through retain the smell out of sight.

How source-level deodorization works

Crews first remove the soot and any unsalvageable porous materials (you can’t deodorize what should be removed). They clean the HVAC system and contents, then apply professional deodorization — which may include thermal fogging, hydroxyl or ozone treatment, and sealing — as part of source removal, not as a substitute for it. The sequence matters: clean and remove the source first, then treat residual odor.

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