Unfortunately, bathroom ventilation fans often are set up so that they exhaust air to the space between ceiling joists, especially if the bath is located on a lower level toward the middle of the house.
The United States Postal Service defines a postcard as: rectangular, at least 3 1â2 inches (88.9 mm) high Ã 5 inches (127 mm) long Ã 0.007 inches (0.178 mm) thick and no more than 4 1â4 inches (108 mm) high Ã 6 inches (152.4 mm) long Ã 0.016 inches (0.406 mm) thick.
The largest postcard size that still qualifies for standard postage is 4.25 inches by 6 inches. The smallest postcard for the standard rate is 3.5 inches by 5 inches. All postcards must have a paper thickness that measures between 0.007 inches and 0.016 inches.