SMOKE PREVENTIVE DROP CURTAIN DEVICE AND METHOD FOR EXECUTING WORK OF THE DEVICE

PROBLEM TO BE SOLVED: To improve the smoke preventive effects.SOLUTION: A device includes right and left basic supports 10, 20 drooping from its ceiling part a, and a flexible drop curtain body 30 extending between the basic supports 10, 20. At least one of the basic supports of the right and left basic supports 10, 20 includes a nearly columnar winder 12 which can wind the drop curtain body 30, and a cylindrical support 13a rotatably covering and supporting the outer circumference of the winder 12 or the outer circumference of the drop curtain body 30 wound round the winder 12, so that the drop curtain body 30 can stretch by turing the winder 12 in the winding direction.