I just checked my NIB boxes in the shed.
765 x 795 x 1420 mm.
Not exact square W x D.
If the box is a squeeze through standard door.then do a 90° turn and try the 765 mm side. That 30mm makes a big difference.
Yeah it's a tight squeeze and rather than damage anything we took it out to be safe-at my joint I have a large sliding door so no worries.
