Abstract : Occupants of family-type fallout shelters require fresh ventilation air at the minimum survival rate of 3 cfm per person. Because cost limitations exclude the use of auxiliary power plants (diesel or gasoline engines) to operate ventilating fans or blowers, an inexpensive, simple, and effective method of supplying fresh air to home shelters is needed. It is demonstrated that a minimum air rate can be obtained in home shelters by inducing draft in the exhaust stack by means of a flame from a kerosene burner which can simultaneously provide illumination. The ventilation test procedure included inducing air to flow through the shelter, determining the actual cubic feet per minute of air flowing, measuring air temperatures at inlet, room, and stack, measuring the pressure drop or restriction to air flow at the shelter inlet, and finding the effects of various stack sizes and configurations upon air flow rates. Data were also taken to determine the effect of various stack sizes and configurations on the fuel consumption of the heating devices. Ventilation of family-type shelters by the induced draft method is effective and reliable if the following conditions are observed: (1) Wind velocities around the stack outlet are kept to a minimum or a good ventilator stack cap is used; (2) filters are not used at the shelter inlet (air taken from body of house); and (3) the intake area of shelter is much larger than the cross-sectional area of the stack.