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.
First-Class Mail is a USPS trademark. 1  The minimum size for First-Class Mail is 5 inches long, 3-1/2 inches high and 0.007 inches thick. 2  The maximum size is 11-1/2 inches long, 6-1/8 inches high, and .75 inches thick. 3  The maximum weight for letters is 3.5 ounces. The maximum weight for envelopes and packages is 16 ounces when you create and print your shipping label on eBay. You can send pieces over 16 ounces as Priority Mail (see below). For more information, please see First-Class Mail prices.