Custom 20 Minute Fire Door
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A door that is negative pressure approved has been tested for fire
resistance in a negative pressure furnace environment. (Check and see if regulations
and laws allow Negative Pressure Rated doors)
A door that is positive pressure approved has been tested for fire
resistance in a positive pressure furnace environment. Positive pressure tests are more
aggressive, and thus the door is more suited for all possible fire conditions. (Check
to see if regulations and laws demand Positive Pressure Rated doors)
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