Guardian doors are different in the number of horizontal and vertical bars in the design. The 1000 Series has one middle horizontal line, 1200 has three middle and 3 vertical, 1300 has three middle and five vertical.

Only the GSL and PSL slimline lock can be used in the 1000 series, but both the 1200 and 1300 Series with their center frieze panel can utilize any locking system.