Take pictures when you do it! I'd like to do one but have no idea where I'd direct the air.
Out the roof with the proper termination boots.
Such as: Shop Broan Metal Roof Vent Kit at Lowes.com
NEVER just blow it into the attic space or crawl space.
See how here:http://www.thisoldhouse.com/toh/video/0,,20783011,00.html
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