Dollar coins have never been very popular in the United States since the removal of specie coins from circulation. Despite efforts by the government to promote their use, such as the Presidential $1 Coin Program, most Americans currently use the one-dollar bill rather than dollar coins.
Width and Height. An interior passage door is any door that you use to move from one room to another, and the code requires these to be 80 inches in height. Because this corresponds to 6 feet 8 inches, door manufacturers refer to this as a 6/8 door.
2â³ DOOR THICKNESS. To calculate your door weight mulitply the size of your door (in square feet) times the number in the chart above (pounds per square feet). The result is your door weight in pounds. For example if you have a 1-3/4â³ thick door that is 8â0â³ by 3â2â³ and made out of oak, you would calculate the square inches of the door (96 x 38 = 3648) and divide by 144 to get the square footage (3648/144 = 25.33).