People driving by a tented house may wonder what the huge tube running up the side of the tent is for. The tube, or duct, is one component of the CAP protocol for flushing fumigants out and fresh air in. Implemented three years ago, the California Aeration Plan (CAP) is a safety plan for the aeration of fumigated structures. CAP’s goal is to lower the exposure of workers to fumigant gas in the performance of their jobs: putting up and taking down fumigation tarps (or tents). What CAP means for California homeowners is even more assurance that when they enter their home after a termite fumigation, it is clear of fumigants.