What are the 4 designation systems used in the classification of fire doors?
What will be an ideal response?
Fire doors are classified by the following designation systems:
1. Hourly rating designation.
2. Alphabetical letter designation.
3. A combination of hourly and letter designations.
4. Horizontal access doors use a special listing indicating the fire rated floor, floor-ceiling, or roof-ceiling assembly for which the door will be used.
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The ignition system is usually divided into ________ different sections
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An integrated circuit is an electronic circuit that is
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