Standard dimensions Available standard dimensions : 31 ¾”, 33 ¾”, 35 ¾” × 79” Available constructions This product is available in 3 constructions : N600, N700 and N900. Fire rating A 20-minute fire rating is available for this product in the N300 and N600 models only (see the "Technical Details" foldout for details), and only on products no larger than 36" x 80'', without doorglass. Closer and panic door Optional closer and panic door (emergency exit) assemblies are available for this model.