PVO8MA By Oliver Macleod Provent Masonry adaptor 8" By Security Chimneys International Limited, and Oliver MacLeod keep the home fires burning in safety and security with a complete line of residential hearth and home-venting and air-conditioning (HVAC) products. Each of insulated chimneys, built for wood-burning, oil-fired and gas-fired appliances, gives you the peace of mind of knowing that they're made from high-quality stainless steel, feature 2" safety clearance from all combustibles, and come with the security of up to a lifetime limited warranty against chimney fires and corrosion. Each of high-tech HVAC products is engineered to provide efficient, economical ways to vent oil-burning and gas-burning appliances. Whether for hearth or for HVAC, each Security and Oliver MacLeod product is engineered for safety