well, for that screen size, check out for cooler master and deepcool models, afaik, cm has the cooling pads which exhale air out of the laptop from the bottomside. so check your lappy's vents first and understand in what direction the airflow moves..
so, if your lappy's outer vents are at the bottom, go with cm ones, or else, check out deepcool's which throw air from the bottom onto the laptop..