The best replacement for iron fence is aluminum fence.

The best alternatives to iron fence are rated as following:
★★★★★  aluminum fence
★★★★  wood fence
★★★  vinyl fence
★  rod iron fence
  steel fence

Your alternative for iron fence is not listed? Suggest!
Speaking about iron fence, one probably shouldn't forget about brick columns.

Other search terms related to iron fence and their ratings are:
★★★★★ brick columns
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