**Short answer:** Northampton splits into two distinct jobs. Residential work here means Victorian-era and early-twentieth-century homes with ductwork that was added long after the house was built. Commercial work means a dense downtown restaurant district where kitchen exhaust cleaning is a fire-code obligation under NFPA 96, not an optional service. ## Older homes, added ductwork A house built in the 1880s was not designed around forced-air ducts. When heating and cooling were modernized — often more than once — the duct system got fitted into whatever space was available. What that produces: - **Converted gravity trunk lines** that are oversized for modern blowers, so air moves slowly and debris settles - **Long flex runs** to reach third-floor and addition spaces, sagging where debris collects - **Improvised returns**, sometimes a wall or floor cavity doing the work of a return duct - **Unsealed joints** at every generation of connection - **Multi-family conversions** with runs shared or adjacent between units None of this is unusual for the housing stock. It just means there are more places for material to accumulate than in a purpose-built system. ## When residential cleaning is warranted - Visible debris at the registers or behind the grilles - A musty smell on startup - Dust resettling within days of cleaning - Rooms that never reach temperature - Reduced airflow at the supply vents - Recent renovation, particularly drywall work or floor refinishing - Any sign of rodent or insect activity near ductwork If the system was properly cleaned a few years back and none of that applies, it can wait. We'll say so. ## Downtown restaurants: NFPA 96 For commercial kitchens, this isn't a maintenance preference. NFPA 96 sets required cleaning frequencies based on the type and volume of cooking, and your fire inspector and your insurer both expect documentation. Grease accumulation in a hood, duct run, and rooftop fan is a fire load. The standard requires the full run cleaned to bare metal where accessible — not just the hood filters and the visible section above them, which is what a lot of quick service amounts to. We clean the complete system, document what was done, and leave you with the certification records you need on file. ## What a NADCA-standard cleaning includes Full system under negative pressure: supply and return runs, registers, and the air handler including blower wheel and coil. Source removal, so debris exits through the vacuum. Duct material identified before tooling goes in — flex and fiberglass duct board can't take an aggressive rotary brush. Before-and-after photos of the duct interior, because it's the only verification you can actually check. ## Get in touch We're NADCA-certified and serve Northampton and the Pioneer Valley, residential and commercial. Tell us what you're dealing with and we'll give you a straight assessment.