The fans on that card are axial fans, which means they just recirculate the air inside the case. If you see a card with two fans they will almost certainly be of the axial type (most graphics cards are this type). The alternative are radial fans (sometimes known as blowers), which on graphics cards exhaust the hot air out the back of the case. Most reference designs use a single radial fan on one end of the card, which makes them quite easy to spot.
As an example of each type:
Axial
Radial.