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I've not seen a clean properly drawing fire blow back, but I haven't had too many open fires; it looks like our new place hasa cowl to help avoid it.
I think perhaps we'll air on the safe side for a little while.
Great Question! And, one that will at least hold me in good stead.
There is no question that it is very likely that you are losing expensive heated air up it!
Knowing that you have already done this, lets say that I'm adding this for other member! -First, Clean the burning area and remove all ashes etc.. that maybe in there-.
Inspect the flue for operation and most importantly that it can fully close! Make any adjust that maybe needed to get the flue to fully close. Check the area around the flue for fit to assure that air cannot simply flow around the flue frame. Do not take the flue from its location or move it to a point that it could come lose. If you do, it will require a professional to reset the flue!
If the side walls or any other parts are metal (like the Flue), consider using a shaker can, spray paint to protect the metal from rusting (high-temperature would be preferred, but not required).
At this point, filling the burning chamber with a fiberglass insulation is a good idea. It will reduce heat loss even more and limit 'things' from taking up living in there. Check with friends and family, commonly someone has a half roll sitting around. FYI: REMOVE THE PAPER BACKING!
NOTE: Whatever is sitting in the burning chamber or in front of the Fireplace, which is part of it, place it in the burning chamber. This will allow you to remove the insulation and replace the exterior fireplace components when you elect to sell and move-on. Fireplaces still have value and having the fireplace 'Stuff' will let your take advantage of that value.
Now, finally to your question. At this point, you can place whatever you want in front of that opening! Just make sure that it is fairly easy to remove!
NOTE: It would be wise to check the very top of the chimney to assure that rain cannot easily get in. Nothing worst than getting all your efforts wet because the chimney top failed and allow rain to enter. That may require a professional.
With your tastes, it will look wonderful!