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.
Standard Exterior Doors. Most building districts adhere to the International Residential Code, which requires the main entry door of a house to be at least 36 inches wide and 80 inches high. 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.