(57) [summary] [task] I provide the lowdown protection sheet that can prevent the wetting of the outer peripheral wall of the lowdown due to condensation. A lowdown covering the upper side of the lowdown for the frame body 10 It provided between the outer curtain 16 covering the upper side of 12 and the outer curtain for the frame body 14, in heaven for the lowdown protection sheet 19 to protect the lowdown from water droplets condensing on the back of the outside curtain, on the back of the outside curtain condensed water droplets and is provided with a overhanging portion 19b in order to prevent the Ru falling into the outer peripheral wall 12a of the lowdown.
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