Nanotextured Surface Dramatically Improve Solar Cell Efficiency. The Engineer posted on January 22, 2015 | | 4074 views. Reducing the amount of sunlight that bounces off the surface of solar cells helps maximize the conversion of the sun's rays to electricity, so manufacturers use coatings to cut down on reflections.
The main entry door must conform to IRC specifications. Exterior doors often are the most visible parts of a house and like interior doors, are available in standard sizes. They range in width from 2 feet to more than 3 feet, and in height from 6 feet, 8 inches to more than 8 feet. Standard thickness is 1 3/4 inches.
The IRC doesn't place restrictions on any other exterior door, however, and lumberyards stock other sizes. The most common widths are 28, 30 and 32 inches. Exterior doors seldom are shorter than 80 inches, but you can find doors 7 and 8 feet in height. Rough-Opening Sizes When framing a door opening, you must account for the thickness of the jamb and floor covering, and you must allow for a gap on all sides of the door for smooth operation.