Yes but you still need the open air space between the last filter and the fan so the air can draw from the whole filter and not just a few inches. The minimum open air space should be 8" but if you have a more powerful fan then you need more room. From the looks of the fan you are running you may have better luck with a 12" air gap. When you force the air through you are building positive air pressure and forcing it through, the slower it goes through the more pressure builds up.

By sucking it through the pressure is more stable and constant providing a stable airflow.