Chuck, there isn't actually a duct for the heater return. There is a grate in the riser of the bottom step, but no duct attached to it, on the 3000 ( at least mine and mtheo's ), the heater, and converter, along with lots of plumbing and wiring are under the shower area, between the basement and living area. There is a panel that seperates this stuff from the basement, but it has a 3 or 4 inch opening all across the top which lets the air from all three areas mingle.
Does any of that make sense, or have I worded everything wrong again??????
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