For Series A domestic door openings up to 3m wide you should add 25mm on each side for the tracks, Eg. if your framed opening is 2.8m you should order a door curtain 2850mm wide. If your opening is 3m you should order a door curtain 3050 wide.
For AA extra wide domestic roller door openings over 3m wide up to 5.1m wide, you should order 50mm on each side for tracks. E.g. 5m wide opening order is a 5100mm wide curtain, and for 4.2m opening order a 4300mm wide curtain.
For any series B light industrial doors, there are large tracks needing 50mm of the curtain on each side. So order 100mm wider than the opening. E.g. 4m wide opening, order a 4100mm wide curtain. 5m opening, order 5100mm wide curtain.
