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By using any length of standard NPT 1/” pipe threaded both ends, you can extend the height capabilities to meet your needs. WARNING: IMPROPER INSTALLATION MAY RESULT IN SERIOUS PERSONAL INJURY! When mounting Chief Manufacturing accessories, the structural system and mounting method MUST be capable of supporting 5 times the combined weight of the total installation. The maximum weight to be installed on the ceiling plate is 500 pounds (226.8 Kg). Unpack and check contents: (1) 4” Flat Ceilin