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: Opening only the upper sash provides ventilation while keeping the lower sash closed, a safer option for homes with small children or pets. Key Considerations Before You Buy
: Both the top and bottom sashes slide vertically, allowing for maximum ventilation. Opening the top sash lets warm air escape while opening the bottom pulls in cool, fresh air. buy double hung windows online
: Measure the diagonals from corner to corner. If they differ by more than 1/4 inch, your frame may be out of square and requires adjustment before a new window will fit. Where to Buy Online : Opening only the upper sash provides ventilation