20 Inch Square Propane Tank Enclosure This 20" square propane tank enclosure is the perfect place to hide your LP tank. About XO From beginning to end XO will deliver more. They will be here to help specify and design the right ventilation for your home. They are ventilation experts. All XO quality products are backed by a comprehensive 2-year In-Home Warranty. Problems happen, they always do. Don't worry, XO will be there to help resolve the issue. Your total satisfaction is their main concern. XO is committed to its vision of becoming the most innovative, customer-oriented appliance company in the world.