looking at the picture gallery, it seems that sager did a nice revision of the cooling system over the NP5796 model.
i'd say as long as you don't insulate the base (covering up all of the bottom/side vents), you should be fine. depending on where you use the notebook (in terms of dust in the air), using a can of compressed air to blow out the vents every once in a while may be wise.
and with my laptop cooling pad, it should be fine then.
thank you for your help