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Duct Integrity

Mastic

Brush-applied sealant, usually with reinforcing mesh, for accessible duct joints.

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All glossary terms

What is Mastic?

The durable, lower-cost sealing method for joints that can physically be reached. Applied with mesh at seams, boots and plenum connections, and used with closure systems listed for duct sealing. Its only real limitation is access — it cannot seal a joint inside a wall, so on systems with concealed leakage it is not a complete answer on its own.

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

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