USHT 08IES30 1655A 8" 30 Degree The elbows are used in pairs to obtain the required offsets. Chimney length may be placed between elbows for greater lateral offset. Intermediate support should be used in ceiling or floor area above elbows maximum diagonal rub is 6 Ft 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