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Extreme 300 Series High Performance Door

We're excited to introduce our Extreme® 300 Series Performance Door.  This high-speed, high-cycle door offers 300,000 maintenance-free cycles and the Apex SmartController - our first intelligent controller.  And, its insulated model boasts an air leakage rating of less than 0.3 cfm/ft2 - meeting and exceeding ASHRAE 90.1 and IECC 2015 air leakage standards - making it the most energy efficient high cycle rolling door available today.  
 

View this product at cornelliron.com