An enclosed space containing gas appliances requires upper and lower combustion air openings of equal size which totals 300 square inches. The owner intends to use two metal grilles each 22″ x 10″. Rated at 70% free area. Will the described grilles meet the minimum requirements for the combuston air?

An enclosed space containing gas appliances requires upper and lower combustion air openings of equal size which totals 300 square inches. The owner intends to use two metal grilles each 22″ x 10″. Rated at 70% free area. Will the described grilles meet the minimum requirements for the combuston air?