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Honestly, go to www.grainger.com. Since Superior/Lennox Hearth/and FMi are all merging into one company you are going to have a very hard time finding replacement parts for older Superior units. Plus the new company, Astria Fireplaces, is going to be using FMI for their woodburning products so no more Superior products available.
If you bring the old blower to your local Grainger they can match it up. I hope this helps.
The fak 1500 number is for the blower assembly. I found this manual for a fireplace using the blower assembly. hope it is what you are looking for. Lennox has bought out the fireplace company and there are no manuals available under superior.
The fan should be installed behind the bottom grill, and then it should blow air around the firebox which then exits out the top grill. Now saying that, let me explain the actual problem you will face. Because you have a open faced wood fireplace, you will not get the heat your looking for, the fire needs 400 cubic feet of air per hour and that air is taken from your opening. Also the inner box doesn't heat up enuff to produce alot of heat on the skin so if you have the fan blowing full blast, it will only cycle the air and not allow it time to heat up as it cycles around the box. I suggest turning the fan speed down so its 1/2 way on or lower, this allows the air time to heat while cycling around the box, but in the end you still won't have a good heater as the fireplace itself isn't one, you should look at having it converted to direct vent gas or ripping it out and replacing it with a airtight wood.