The Universal VentGuard from Shelter offers a reliable solution to protect vent terminations from animal intrusion for all non-dryer vent applications. Universal VentGuards are constructed of 18-gauge 3/8″ 304 stainless steel mesh and durable 16-gauge, stainless steel base that will not rust or corrode. It is easy to install, and fits over most 3″ or 4″ hood style bathroom and kitchen exhaust vents.