About selection of return grille
About selection of return grille
(OP)
When select return grille, what's the rule to follow.
Someone says the speed should be kept under 500 fpm. While according to some product catalogue, if using the lowest NC level to select, the speed can be 800 fpm or even higher.
I am a little confused. The reason to keep the speed is to control noise, if the NC level is low enough, why should we use 500 FPM? (ACCA manual D requires 500 FPM for return grille)
Someone says the speed should be kept under 500 fpm. While according to some product catalogue, if using the lowest NC level to select, the speed can be 800 fpm or even higher.
I am a little confused. The reason to keep the speed is to control noise, if the NC level is low enough, why should we use 500 FPM? (ACCA manual D requires 500 FPM for return grille)





RE: About selection of return grille
500 fpm is a good rule of thumb.
RE: About selection of return grille
If you are concerned, you can usually find the actual free area and size the grille accordingly.
RE: About selection of return grille