Quarter inch round is not going to be heavy enough for supporting your blower. A single 1/4 x 1 inch bracket probably wouldn't be enough either. 1/4 inch plate could be used, but, if I had the inclination to attach it directly to the forge, I would use heavier material (maybe 5/16th to 3/8" plate), welding that plate to the forge and bolting the blower to it using the existing holes.
Personally, I'm not sure I would attach the blower directly to the forge. I would probably make a stand (pipe on base) and use flexible pipe to the forge so I could move the blower to suit differing needs.
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