Would Silver Stone Air Penetrators Make For Decent Exhaust Fans

I plan on upgrading my case to a Bitfenix Shinobi, and when I get the new case I would also like to revise my cooling. In the front of my Antec Three Hundred I currently have 2 Silverstone Air Penetrators. These fans are rated for low CFM, but due to their design channel air far more effectively, their description is like a concentrated cylinder of moving air, rather than a spread out outwards cone of weaker air movement.I would use them as front mounted intake fans, except they are the LED version, and give the best visual effect I have seen (the whole fan blade circle is strongly lit with blue light, rather than conventional LED fans with strips of strength with fading light levels further away from the LEDs mounted in the frame, this is because in Air Penetrators the LEDs are mounted in the centre bearing). Because of their stunning visuals, I would rather have them visable, meaning in the top mounted fan brackets, but this means they would be functioning as exhaust fans (who mounts intake fans on the top of their case anyway?).I am unsure however because their airflow is far lower than many fans (only about 35 CFM, you can check it here: SilverStone Technology Co., Ltd.- AP121-L), does anyone have experience or the know to tell me weather these would be effective exhaust fans? To help them I would look at some serious intake fans to help push air though, but my main concern right now is the effectiveness of the fans I already own as exhaust.