Can you get a knock down (3 piece) pressed steel frame that has a fire rating?
Yes, most knock down frames (with no welding option on a pressed steel frame) can be fire rated up to 90 minutes provided they are installed correctly in a fire rated partition. Typical hollow metal frames (Curries / Steelcraft / Republic / Ceco) industry standard heavy and medium duty commercial and the like can be rated as high as 3-hours as knocked down or welded but are typically roll formed. Hollow metal doors can be rated up to 3-hours. Wood doors can not exceed 90 minutes.
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