Why 14x12 and not Commercial Brood

[Rosti]

i use a standard brood and 90mm Eke ( thornes about £16 or mine is just DIY 90mm x 460mm square box made of 19mm (oak) floor boards, no beespace or runners....now totaly propilised together by bees

i use thornes hoffmans 14x12frames with one 14X8 frame to induce drone comb ( to cull)

MM thanks for this, have come to that conclusion but good to know it's working for someone else. Have you screw plated the eke and the BB or used anoth method? Regards, Rosti