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i m always use 12" easy if you get 36" rubber you can cut 3 save you money mate
Most domestic 12" Most commercial 14" I carry both blades and channels (dog-eared) in my BOAB but only one handle (unger) to clip them into as necessary.Smaller is better with GG4 as there is less slip.(Downstairs and insides only now as wfp for nearly all upstairs)