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HVAC Delivery Components Vocab

What is an air distribution outlet comprised of deflecting blades blowing air in different directions?

Diffuser (supply)

Fire Damper

Plenum

Duct

What is a combination grille and damper assembly over an air opening?

Diffuser (supply)

Louver

What is a louvered or perforated covering for an opening in an air passage?

Grille (return)

Louver

Diffuser (supply)

What is an air intake or exhaust with fixed blades (primarily exterior)?

Louver

Shutter

What is a motorized valve or plate that stops or regulates the flow of air inside a duct, VAV box or air handler?

Damper

Louver

Grille

What is an open interstitial space used for non-ducted return air?

Drop-ceiling

Plenum

Crawl space

Cavity

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