Republic's DM series doors are available in 18 or 20 gauge cold rolled steel or galvanealed (A60) steel. Republic's "McKenzie Edge" lock edge is continuously lap seam welded and planished, providing a near seamless appearance - SDI levels 1 and 2 - Physical performance level A. 3 channel full flush square edge steel door.
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Videos for Steel Doors - DM Series
Republic Doors and Frames an Allegion Brand video of Intro to Door Hardware: Anatomy of a Fire Door