laptop coolers

Anyone know where I can find a laptop cooler manufacturere that makes coolers with the following:

1) fans push air TO the bottom of the laptop (or at least reversible)
2) anti static filter on the cooler intake

Why are there so many coolers available that suck air from the bottom of the laptop? This seems kind of silly to me as Ive never seen a laptop design that exhausts down toward the table .... am I missing something? wouldnt that make the cooler's fans work against the laptop's internal fans?

Thanks for any help!

I set my laptop at the edge of a cafeteria type food tray. It got very hot before I did, and started to burn my leg. I thought that they were replacing batteries that caught fire, but found that mine wasn't in the recall list.

You can also blow air into the laptop to get rid of some dust. When I did that, the fan started turning off instead of staying on all the time. I think it needs it again, though.