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  1. Advice on drilling heater holes thru floor?

    Camper Vans and Conversions
    I'm still confused about getting the chinese diesel heater intake and exhaust ports thru 1" of polyiso and 1/2" plywood, plus whatever vinyl flooring I decide to put in. Those ports aren't really long enough to go through all that, are they? Should I remove enough flooring to allow the heater to...