Window and door frames will sometimes vary from side to side (width) and from top to bottom (height). When measuring the inside dimensions of the frame in which the Roll Away screen will fit, be sure to measure the width of each frame at the top, middle and bottom. For each height measurement measure at the left and right side of each frame opening. Measure to the nearest 1/16".
When ordering inside mount products, always use the smallest of each dimension. Surface mount products should use the largest of each dimension.
EXAMPLE: The measurements you should record would be 21" x 48", as 21" is the smallest width and 48" is the smallest height. A 1/16" deduction in width and height dimensions are necessary for a proper fit. Therefore, we would manufacture your Roll Away Screen to measure 20 15/16" x 47 15/16".
Roll Away Window screens must always be installed square to operate properly. Shimming with wood shims, foam, tape, or silicone may be necessary to facilitate a proper fit.