Duct cleaning service as per NADCA Standard:

Cleaning Heating, Ventilation, and Air Conditioning (HVAC) systems is a precise technical process that goes beyond surface dusting. To ensure indoor air quality and system efficiency, the National Air Duct Cleaners Association (NADCA) established a global benchmark known as ACR: The NADCA Standard, which defines the professional framework for assessing, cleaning, and restoring these systems.

Air duct cleaning should follow a procedure based on the NADCA ACR Standard (Assessment, Cleaning, and Restoration):

1.      Assessment & Inspection:

Before commencement, a visual inspection of the system is mandatory to understand the layout of the home or building, which will provide important information needed to establish the scope of work, determine contamination levels, and the engineering controls that are needed.

The standard recommends a periodic inspection schedule (annually for commercial and industrial buildings) to ensure the system remains within acceptable cleanliness limits.

2.      Engineering Controls:

This is the most critical part for preventing cross-contamination. It involves:

Negative Pressure: The section being cleaned must be kept under continuous negative pressure relative to occupied areas.

HEPA Filtration: All vacuum collection equipment exhausting indoors must be equipped with

HEPA filters (99.97% efficiency at 0.3 microns).

3.      Mechanical Cleaning Procedures:

The standard relies on the principle of “Agitate and Capture”:

Agitation: Using mechanical tools (rotary brushes, compressed air) to dislodge contaminants adhered to internal surfaces.

 Capture: Using high-powered vacuum devices to convey and collect dislodged debris into closed containers.

4.      Detailed Component Cleaning:

Cleaning is not limited to ducts; it includes:

·         Air Handling Unit (AHU): Cleaning fans, condensate pans, and cooling coils.

·         Coils: Cleaning coils using dry (Type 1) or wet (Type 2) methods to restore heat exchange efficiency.

·          Dampers & Grilles: Cleaning all air outlets/inlets and restoring them to their original positions.

5.   Disinfection (If Required):

Disinfection is the use of approved chemicals to eliminate bacteria, mold, viruses, and odors, and it is performed only after complete duct cleaning.

Comparison: Traditional vs. Professional (NADCA) Cleaning

Traditional Cleaning	Professional (NADCA) Cleaning
Manual brushes & regular vacuums	Mechanical rotary brushes,  HEPA vacuums, and robots
causes room contamination	Continuous negative pressure (prevents contamination)
Temporary improvement	Sustainable efficiency & high air quality

Frequently Asked Questions (FAQ) – Duct Cleaning

Ø  How is duct cleaning performed

·         We create negative pressure inside the duct, then use mechanical tools (brushes/robot) to dislodge dust while simultaneously capturing it using HEPA vacuum systems.

Ø  What equipment do you use:

·         Robotic cleaning systems

·          Rotary brush machines (ROTAIR)

·         HEPA vacuum systems (High-efficiency particle removal (up to 99.9%)

Ø    Can I see the results?

·         Before & after photos/videos

·         Full technical report.

Ø  What makes your service different:

·         NADCA-compliant process

·         Advanced robotic cleaning

·         Full documentation

·          Safe, damage-free cleaning

Ø  How do you access the ducts:

·         Through existing access openings or temporary access panels, if needed.

·         All openings are professionally sealed after work.