I looked up the Lasko 3733 fan tonight to price it, and see that in March of 2011 a recall was issued for both the Lasko and Galaxy fans that were sold in 2005 and before. Just thought I'd let anyone who has one of these older units that there is a fire danger. The fix is fused outlet Lasko will send to anyone owning one of these. Just Goggle Lasko 3733 box fan and you'll see the notices.
It seems the newer ones have the fused cord, so their safe.