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Therma-Tru offers an industry-leading selection of fiberglass 20-Minute Fire-rated doors. All of our solid panel fiberglass wood edge doors can be ordered as 20-Minute Fire-rated product, featuring a proprietary cement-based core. Solid panel steel wood edge doors in select sizes can be ordered with the 20-Minute Fire-rated label. The doors are tested to withstand a minimum of 20 minutes of fire exposure at temperatures that reach more than 1,400 degrees Fahrenheit, and are certified and approved for use with mortise locks.