Abstract: A system for microbially and/or chemically decontaminating a room such as a hotel room includes a vapor generator which supplies a decontaminant vapor, such as hydrogen peroxide vapor to the room. The room is then aerated to a level at which it is safe for normal occupants to enter. By using a two step aeration, with a second step at lower humidity than the first, the concentration of residual hydrogen peroxide is reduced rapidly to safe levels of 1 ppm or less, typically about 0.5 ppm, in under four hours. The room is rendered substantially free of contaminants, such as those responsible for Severe Acute Respiratory Syndrome (SARS), Norwalk virus, and unpleasant odors.

Abstract: A method for metering a liquid sterilant from a reservoir or other container into a vaporization system, in accurately and reproducibly measured amounts. The method includes the steps of delivering the liquid sterilant from the container into an accumulator, at a first delivery pressure and a first delivery rate, discontinuing the dispensing of liquid sterilant when a predetermined amount of sterilant has been transferred from the container into the accumulator, and delivering liquid sterilant from the accumulator into the vaporizer, at a second delivery pressure and a second delivery rate. The first delivery pressure and first delivery rate are preferably lower than the second delivery pressure and second delivery rate.