FIELD: construction industry. SUBSTANCE: block includes box with louverboard grate on outer wall, partition and holes for air inlet and outlet. Valve fixture with gate to control air flow shuts off hole in partition of box on its inner side. Gate and box are faced with heat insulation nonhygroscopic material. Block can have two or more valve fixtures for optimal organization of natural air flows. EFFECT: increased ventilation efficiency of rooms in building with achievement of required level of heat- and sound-proofness. 4 cl, 2 dwg
