We offer two sizes in our SlipSafe Circular Floor Signs category. One has a diameter of 9 inches and the other has 17 inches. Both of the sizes are constructed from 18 mil thick anti-skid vinyl with grit surface and permanent adhesive backing. For a 28 inches wide entryway, both the sizes will fit well. While a 9 inch sign would leave plenty of room on either side, a 17 inch sign would cover more than half of the width of the way. However, messages like “Please Wait Here for Your Turn” and “Stand Here for Temperature Check” on the 17 inch floor sign would be much more conspicuous than the 9 inch sign. That said, many customers also buy multiple 9” signs for the entire passage to maintain social distancing between incoming individuals. We recommend bigger sizes for better visibility but it completely depends on your requirements and application area as to which size will work best.