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.
What is USPS First Class Mail? First class mail is the cheapest mailing service available under USPS for lightweight items such as letters, cards, or small parcels. Barring Alaska and Hawaii, most of the destinations across US are covered by First Class mail in 2 to 3 business days at rock bottom rates.