My "IS50 and IS20-DWS ceiling template" shows two different diameters for the circle to be cut. this is manual drawing C3481M.
- C3481M Manual
Manual reference of Diameter template for IS50 and IS20 cameras
This shows 7.09 inches and in parenthesis at a different note location shows 6.3 inches. The correct value is 7.09 inches or 18.0 centimeters. This manual was corrected in August of 2011 and is now numbered C3481M-A