None.
An ounce is a measure of mass while a square foot is a measure of area in 2 dimensional space. The two measure different characteristics and, according to basic principles of dimensional analysis, any attempt to convert between the two is fundamentally flawed.
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It doesn't equal any feet. Because 'square metres' is a metric measure of AREA. 'feet' is an IMperial measure of LENGTH.
155.55 square yards in 1,400 square feet.
15 square feet = 1.66 square yards.
218 squared meters * 10.764 squared feet per squared meter = 2346.552
512 feet squared