Fir-tree - Rather, juniper (1 Kings 5:6 note). Each door was made in two parts, which folded back one on the other like shutters, by means of hinges. The weight of the doors no doubt made it inconvenient to open the whole door on every occasion.
Related Commentaries of 1 Kings 6:34
1 Kings 6:34
34 And the two doors were of fir tree: the two leaves of the one door were folding, and the two leaves of the other door were folding.