I have been told/ordered to increase the ventilation area to the housing of our gas central heating boiler room. I presently have two grills of 8000mm squared - that is 80 sq cm. I am required to fit a grill 141 sq cm at the top of the access door to the boiler room and a grill 282 sq cm at the bottom of the door. What sizes of grill will provide the above free area?
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