PROBLEM TO BE SOLVED: To provide an air supply and exhaust system for an airhouse or an air curtain, capable of forming an air layer for heat insulation in prescribed layer thickness as long as air is blown to the air layer for heat insulation to expand it by means of an electric fan, while an air exhaust hole is automatically formed for excessive air over the prescribed layer thickness to keep the prescribed layer thickness, so that excellent heat insulation effect is expected, and there is no need of operation control to the electric fan.SOLUTION: For an inner air layer forming film 20, a fixed end 20b developed from a fixed end 20a on the other side is stopped to a forward side opening edge part of an air exhaust hole part B. For an outer air layer forming film 30, a fixed end 30b developed from a fixed end 30a on the other side covers the air exhaust hole part B to be stopped to a side surface of the air house 1 on the opposite side. For an inner air layer forming film 21, a fixed end 21a on one side is stopped at the stop position, and a fixed end 21b on the other side is stopped to the forward side opening edge part of the air exhaust hole part B. An air supply tube 6 is installed to the position of the fixed ends 20b and 21b of the inner air layer forming films 20 and 21 adjoining the air exhaust hole part B.
