Mine is similar to dg's. I can't see how he mounted his to the floor, but mine is mounted with a 3/4 floor flange. The up pipe is 3/4 X 18" with a 1/4" plate welded to it. I drilled a hole in the plate large enough for the pipe to fit into before welding. I ran the ducer cable and power wires thru the flange, pipe and plate.