Yes you can and it does push quite a bit of air around, here are some pix I found for you: all the parts are available from Lowes or HD for cheap.

http://farm4.static.flickr.com/3028/...b5c4b063cd.jpg

http://farm4.static.flickr.com/3239/...4be19681df.jpg

http://farm3.static.flickr.com/2102/...6d9b8217f1.jpg

http://farm4.static.flickr.com/3051/...2b193f63ae.jpg

http://farm4.static.flickr.com/3028/...45735f43c5.jpg