HOME: How do I add a quiet blower or fan to a gas fireplace?

I have beautiful fireplace in my family room. It is gas rather than wood burning, and it vents straight outside.

Due to the nature of how it is vented, I don't really get much heat from it, and I think I am losing a lot of the heat it could be generating during winter (and therefore wasting a lot of energy and increasing my cost.)

After reading my fireplace manual, it appears that I can install a blower that can move heated air from around the exhaust back into the room. There were no instructions on how to do so, however.

What would it take to install a blower for my fireplace, and where might I find a very quiet blower? The noise level is an important factor, as I've heard some fireplace blowers that are extremely noisy, and given the acoustics of the room, I worry it will drown out sound from the entertainment system.