HVAC-gurus,

We are planning on doing a major home renovation and are (barely) in a FEMA-rated 100-year flood zone. This means that we can't put anything "non-waterproof" in our first floor crawlspace. However, we'd still like to use our existing forced hot air furnace and run ducting under the floor.

Does anyone out there know of any "flood zone rated" ducting (say 6" diameter) system that can be used for this?

I've searched everywhere I can think of, but come up empty so far.

Thanks!

Bruce