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Dunbarton Corporation | Dunbarton RediFrame SlimFold Achiever HollowMetal Dunbarton Corporation | Steel Doors & Frames - Commercial, Industrial, Multi-Family Dunbarton Corporation: Leading manufacturer of steel doors and frames for commercial, industrial, and multi-family buildings. Offering standard and custom solutions, fire-rated options, and a wide range of accessories, steel doors, steel frames, metal doors, metal frames, commercial doors, industrial doors, multi-family doors, fire-rated doors, custom steel doors, door frames, RediFrame, RediFlex, SlimFold doors,]