An exit route must meet minimum height and width requirements. [29 CFR 1910.36(g)] The ceiling of an exit route must be at least seven feet six inches (2.3 m) high. Any projection from the ceiling must not reach a point less than six feet eight inches (2.0 m) from the floor.
4. adjective. In Britain, first-class postage is the quicker and more expensive type of postage. In the United States, first-class postage is the type of postage that is used for sending letters and postcards. Two first class stamps, please. The price of mailing a first-class letter will not be increasing this year.
As of March 2014, the postage for a letter sent via First Class International Mail from the United States to Alberta, Canada is $3.33. This postage covers one envelope that is no more than 15 inches long, 12 inches high and 0.75 inch thick with contents that are not worth more than $400.