The use of the letter "do (or to 戸)" implies that they were Chinese continental style swinging doors rather than shitomi (a generic term for timber shutters or doors that generally have vertical and horizontal lattice attached to the exterior surface and sometimes to the interior surface as well).
戸とあるから、蔀（しとみ）ではなく大陸様式の扉開き戸であったと考えられる。