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Standards

NADCA ACR Standard

The industry standard defining what a legitimate duct cleaning actually is.

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All glossary terms

What is NADCA ACR Standard?

The Assessment, Cleaning and Restoration standard published by the National Air Duct Cleaners Association. Its core requirement is source removal — putting the system under negative pressure and mechanically agitating every run so debris is extracted rather than redistributed. It requires proper access openings and their correct resealing. A service that vacuums registers is not cleaning to this standard.

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Other terms in the glossary

MERV
The standardised scale for how efficiently a filter captures particles.
Pressure Drop
The airflow resistance a filter or fitting adds to the system.
Static Pressure
The pressure the blower works against — the measurement that says what filter a system can take.
Source Removal
Extracting debris from the system rather than dislodging it into the airstream.
Plenum
The main air chamber directly at the air handler where supply or return trunks connect.
Boot
The fitting where a duct run connects to a ceiling, wall or floor opening.

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