The SPD Sliding Patio Door System offers value and performance for the patio. The low maintenance PVC frame and sash provide durability and smooth operation. The SPD Sliding Patio Door System comes fully assembled and is backed by a ten-year limited warranty. SPD also features a DP-50 performance rating, which assures that the SPD Patio Door System can withstand 171 mph winds, water penetration of 8” of rain per hour driven by 54 mph winds and air infiltration equal to 25mph winds.