A beehive is a piece of precision agricultural equipment. The box is built around the principle of bee space. If you get a measurement wrong, it will work less well.
Every part of the hive must employ bee space in its design. This means that a Langstroth hive will be built around a standard set of dimensions. Frames need to employ bee space.
2.How We Use Bee Space In A Deep Brood Box and Other Parts Of The Hive
Be very wary when buying old second-hand boxes – take an accurate measure – I actually use a digital caliper to measure the bee space gaps and a steel ruler. Check the measurements against a drawing of a hive.