An HVAC system is not just ductwork. Cleaning the ducts and leaving the coil, the blower wheel and the drain pan fouled is cleaning the part that is easy to photograph.
The Whole System
- Supply trunk and branch runs — brushed and vacuumed under negative pressure
- Return ductwork and return plenum — where dust concentrates and, where condensate reaches, where microbial growth appears
- Evaporator coil — cleaned, fins straightened, heat transfer restored
- Blower wheel and housing — the felt-like dust layer on each vane costs more airflow than most ductwork restriction
- Condensate drain pan and line — cleaned and flushed; a blocked line floods the unit below
- Air handler cabinet — interior cleaned, insulation condition assessed, access panels resecured
- Registers, grilles, diffusers — removed, cleaned, refitted
Duct Material Determines Method
Sheet metal takes a rotary brush. Flexible duct does not — brushing tears the inner liner and destroys the duct. Duct board is different again: fibreglass surfaces cannot be brushed aggressively without releasing fibres into the airstream.
A vendor arriving with one tool for all three is going to damage your system. We identify duct material before quoting, because it changes both method and price.
Verification, Not Assertion
NADCA’s ACR standard defines what a clean system is and how to demonstrate it. Before and after photographs of every component. Coil condition report. Deficiency log with locations. Completion report referencing ACR.
What We Find in Multifamily
Disconnected flex duct discharging conditioned air into ceiling voids. Crushed runs. Loose or missing access panels — a finding on a Jacksonville senior living community across nine buildings, alongside mould-like debris inside the return plenums. Fouled coils. Blower wheels nobody has touched in fifteen years.
Read the Jacksonville case study.
Commercial air duct cleaning | Coil cleaning
Frequently Asked Questions
What is the difference between duct cleaning and HVAC system cleaning?
Scope. Duct cleaning addresses the ductwork. HVAC system cleaning addresses the whole assembly — supply and return ductwork, the return plenum, the evaporator coil, the blower wheel, the drain pan and line, and the air handler cabinet. NADCA’s ACR standard defines the whole system, not just the ducts, because cleaning half of it accomplishes very little.
Why is the blower wheel important?
A blower wheel accumulates a felt-like layer of dust on each vane. That changes the aerodynamic profile of the wheel and reduces airflow substantially — often more than the ductwork does. It is rarely cleaned because it requires removing the assembly.
How do you verify the system is clean?
Visual inspection under NADCA ACR, before and after photographs of every component, and where specified, surface comparison testing. Verification is what separates ACR-standard work from a vendor with a shop vacuum.