PRICES MAY VARY. IMPORTANT: Measuring accurately is critical to get the correct size for your classroom window. Before you order, please read the instructions about how to measure and review our "How To" picture. STANDARD AND CUSTOM SIZING: IMPORTANT: Please add 3" to your glass width and 3" to your length before choosing your size to ensure a proper fit. Available in 9 standard sizes which cover most interior windows in elementary, middle and high schools, as well as universities and…