Precision Opening: Overall dimensions: 24x24x2 inches/30x21x2 inches/26x24x2 inches/ 28x19x2 inches /31x31x2 inches/34x19x2 inches, installation size: 21x21inch/27x18inch/ 23x21inch/25x16inch/28x28inch/31x16inch, it is recommended to reserve an…