* Note:All R.O. Note that you can visit our drawing generator page for exact dimensions for your chosen model, which will calculate specific dimensions for the door you need. Our team of Design Specialists are experts when it comes to customized projects. In some cases (usually 7 or 8 heights), 20 width residential doors are available. For use by qualified professionals only. Need some design assistance? They can use an Allen wrench to access the exposed drive. Rolling fire door:Coiling fire doors with a standard UL rating will require headroom clearance between 14 inches and 16 inches.