Difference between grille and diffuser and their sizes.

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Grilles and diffusers are air distribution devices used in HVAC systems. Grilles are fixed and diffusers are adjustable.

Grilles are fixed air distribution devices that allow air to flow in a single direction.
Diffusers are adjustable air distribution devices that allow air to flow in multiple directions.
Grilles are typically smaller in size than diffusers.
Grilles are commonly used in return air systems while diffusers are used in supply air systems.
Grilles and diffusers come in various shapes and sizes depending on the application.
Examples of grille shapes include linear, perforated, and egg crate.
Examples of diffuser shapes include square, round, and slot.
The size of a grille or diffuser is determined by the amount of air flow required for the space it is serving.

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