Curious about venting through the floor, as well. Our Splendide said specifically not to vent through the floor or ceiling.
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No problem venting through the floor IF, you don't vent into a confined space. There is no skirting around our trailer so that won't be a problem. Everything is sealed from moisture on the bottom of the trailer too. On a real cold day there will be a lot of steam coming out of the vent but it will just condensate and drip off.
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Ran the propane line up through the floor. While I had the pants off installing the SeeLevel system, I marked where to drill the hole so I would miss the holding tanks and the cross member. While I was under the trailer doing some plumbing I though I would install A BBQ outlet too.
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Installed some carpet lined back stops to hold the unit in, with straps while we travel. Cut the vent hole through the back of the closet. It's a 5" hole for a 4" vent. I will be able to connect the vent hose from the back. Then run it over to the outlet.