Chamberlain 1/2Hp Chain Drive OpenerDrive Type: Long lasting chain drive. Trusted security: Security+ 2. 0 technology provides unmatched encryption (100 billion codes). BILT intelligent instructions: 3D instructions for a quick, easy installation. Lifting Force 1 2HP Support standard aluminum doors with a lift force equivalent to 1 2 HP*. Durable Chain Count on long term reliability with the durable chain drive system.
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