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?
Register (supply)
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
Register (supply)
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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