There are lots of possibilities for making a standard door in to a pair, just a bit of imagination and you're there.
All double fire doors must be fitted with the correct level of fire & smoke seals as well as the correct frame and hinges, none of the doors are rebated where they meet, sizes are "tight" without any fitting clearances allowed, many of the fire doors are deemed "SPECIAL ORDER", this means that any orders that are subsequently cancelled by the customer are NON-REFUNDABLE.
JB Kind Company profile:
Established in 1870, JB Kind has always operated in the timber sector, and in 1983 it began its door division. Now widely considered a leading specialist in wooden doors, JB Kind balances profitability with environmentalism, ensuring all of its wooden doors are procured from sustainable sources.