The 3x Industrial cartridge is recommended for ALL TYPES OF ORGANIC ODORS! For use with HVAC systems, high-velocity blowers, or fans where air can move through the cartridge to release the non-toxic, odor-neutralizing dry vapor. Membrane contains safe, natural essential oils. Treats areas up to 20,000 cu. ft. Cartridge life varies from 270 hours to 60 days, depending on application. To activate cartridge, rotate both metal end caps equally. Optional stabilizer or duct tape may be used to position cartridge in air duct or in front of blower. When cartridge is not in use, close both end caps. Store in a cool, dry place. IMPORTANT: Direct contact with cartridge oils may damage some surfaces