The Vaportek heavy duty stand-alone cartridge is designed as a passive odor controller specifically for use in hvac systems, including high velocity air cleaners and airdryers, as well as for use in disaster restoration work. The Vaportek cartridge contains a patented membrane that releases a non-toxic odor controller into the air the liquid odor control compounds contained inside the cartridge are complex blends of natural oils. The deodorizer compounds have been used by Vaportek in installations worldwide since 1979 to control odors in healthcare facilities, offices, factories, hotels and homes.