John Gill Commentary 1 Kings 6:34

"and two doors of fir-wood: the two leaves of the one door were folding, and the two leaves of the other door were folding." — 1 Kings 6:34 (ASV)

And the two doors [were of] fir tree the posts were of olive, but the doors of fir, and they were both folding doors, as appears by what follows:

the two leaves of the one door [were] folding, and the two leaves of the other door [were] folding ; which, taking up less room, made the passage wider, see (Ezekiel 41:24) .