Get the Genie 8' Door Chain Extension Kit Model EKCC (Item #37301R) from Garage Door Supply Co. Compatible with the ChainMax® 1000 Model 3022-TV Residential Chain Drive Garage Door Opener by Genie (Item #37280V). While the ChainMax® will lift almost any door up to 7' high right from the box- the extension kit will allow you to operate doors up to 8' high.
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