Pella 250 Series 59 1 2 in x 47 1 2 in x 3 1 4 in Jamb Left Operable Vinyl Sliding Window, White, Half Screen Included Residential Laminate Fresh White Steel Extension Downrod Porch Lights Fresh White Steel Extension Downrod smoke developed 50 or less) Sag Humidity resistance Standard Mold Mildew resistance Standard Additional features Dimensional stepped visual with tegular edge Price per square foot $2 Specification Details Series Name 250 Series Actual Size (W x H) 59 1 2 in x 47 1 2 in Common Size (W x H) 60 in x 48 in Rough Opening Size (W x H) 60 in x 48 in Jamb Depth Measurement 3 1 4 in Frame Material Vinyl Frame Profile Flat Color Finish Family White Exterior Color Finish White Interior Color Finish White Hardware Color Finish White Sash Configuration 2 lite Sash Operation (Exterior View) Left operable Glazing Type Double pane Glass Insulation Low E argon (SunDefense Low‑E) Glass Strength Annealed Argon Gas Insulated Yes Design Pressure (DP) Rating 35 Clear Opening Size (W x H) 24 51 64 in x 43 1 4 in Clear Opening Sq Ft 7 A: Double pane annealed glass with SunDefense Low‑E coating and Argon gas insulation