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Grilles vs. Registers

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kmtswims

Mechanical
Jun 8, 2006
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What is the difference between a Grille and a Register? What is a diffuser considered, a grille or register??
 
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Definition according to SMACNA (Sheet Metal and Air Conditioning Contractor's National Association)

Grille - A louvered or perforated covering for an air passage opening which can be located in the sidewall, ceiling, or floor.

Register - A grille equipped with an integral damper or control valve

Hope this helps!
 
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