I'm in the same boat, I might try these out.

http://www.ebay.com/itm/4-6-8-10-FLEXIBLE-Aluminum-DUCTING-HOSE-8-25-ft-EXHAUST-DUCT-AIR-VENT-fan-foot-w/120932582252?_trksid=p2054897.c100204.m3164&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140407115239%26meid%3D4dbab5919e1f45dea29df8ef649421cb%26pid%3D100204%26rk%3D2%26rkt%3D30%26mehot%3Dpp%26sd%3D231508503283