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Click on any link below to view the UL ratings. All have been tested to UL standards. Scroll to the bottom of the page to see the definitions for each UL rating type. A very interesting calculation.
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UL Systems

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Unique Fire Stop Products | UL Systems Ratings | UL

For approximately 40 years, unprotected or improperly protected penetrations have presented a subject of much concern to the fire-protection community. The arriving firefighters discovered several fires had broken out in five remote locations, filling many different areas of the building with smoke. According to the National Fire Protection Association's report on the fire, unprotected vertical and horizontal penetrations provided one of the major contributing causes of the rapid, erratic spread of smoke and fire. These openings allowed the smoke to spread beyond the electrical rooms and into occupied floors. Numerous fires similar to this one have emphasized the need for fire stopping the penetrations made by electrical installations.
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Fire Stopping: What Every Contractor Needs to Know

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