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Could anyone navigate me in the right direction . how do you relate the free area of a make up air grille with the extraction flow rate of a commercial catering hood , or how do you calculate how much air will pass through a make up air grille in a commercial kitchen . its just its somthing i dont know much about . ive even asked comcat 1, 2 and 3 engineers and they say its a specialised subject . i know the 85 % mechanical make up air rule , but not sure how to apply .....cheers