Pressure Requirement
Diffuser grille or minimum pressure for the given volume of air is reflected in the final system requirements fan power.
Diffuser or grille with the lower pressure rating requires less energy than devices with a higher pressure rating for the given volume of air and the effective area. Diffusers and grilles of the specified size, having lower pressure on the ratings, as a rule, have a low noise level rating on the specified volume of air...
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