These are the external dimensions in millimetres of the British Standard Hoffman Frames. They fit WBC, National and a few non-standard hives. No part of any hive box, apart from lug seating parts should be more or less than a bee space from any of its parts.
The above are the external dimensions of the Hoffman type British Standard Brood Frame.
The Hoffman Shallow Frame dimensions are shown in the drawing above and the deep (14" x 12") frame is in the drawing below.
