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en.wikipedia.org/wiki/Fire-resistance_rating

Class 150 Rating. This is the rating required to protect microfilm, microfiche, and other film-based information storage media. Above 150 °F (65.5 °C) film is distorted by the heat and information is lost. A Class 150-2 Hour vault must keep the temperature below 150 °F. for at least two hours, with temperatures up to 2,000 °F.

www.reference.com/government-politics/class-1-fire-rating...

In the flame-spread rating test, a score of 0 to 25 constitutes a Class 1 rating. The score is relative and balanced between asbestos cement sheet, with a score of 0, and pure red oak, with a score of 100. Building materials with a Class 1 fire rating are often man-made or nonorganic substances.

www.safeandvaultstore.com/pages/fire-ratings

The following information applies to both Fire Rated Safes and Burglar/Fire Rated Safes. Remember that a Fire Safe without a Burglar Rating is not recommended for Burglar Resistance. If you need both Fire and Burglar resistance, always consider a Burglar/Fire Rated Safe over a Fire Rated safe only. There are many types of Fire Ratings.

www.amsecusa.com/fire-ratings-explained

Fire Ratings Explained. ... HOUR AND TWO HOUR FIRE LABELS. U.L. Label/Class 350°F-one hour and Class 350°F-two hour. The safe will maintain an interior temperature less than 350°F when exposed to fire for a period of one hour at 1700°F or for a period of two hours at 1850°F. Safe must successfully undergo all other requirements for the ...

www.chicago.gov/content/dam/city/depts/bldgs/general...

• Class C fire-resistive rated door or shutter shall mean a door or shutter with a minimum fire-resistive rating of ¾ of an hour (45 minutes). • Class D fire-resistive rated door or shutter shall mean a door or shutter for exterior use with a minimum fire-resistive rating of 1 ½ hours (90 minutes).

www.panelbuilt.com/news/press-releases/understanding...

Understanding Modular Fire Wall Classifications. Understanding the difference between Class A, Class C, and 1-hour fire rated panels will ensure you select the right building for the right application; and can mean a lot fewer insurance headaches down the road. Conrad Walker.

www.klsecurity.com/class_a_fire_rating

While there are many types of fire ratings issued by U.L., there are few online resources that that provide specific information about the Class A Fire Rating, Class B Fire Rating, Class C Fire Rating and Class D Fire Rating. For the most part, these ratings are placed upon roofing materials. But there are additional fire ratings for Fireproof ...

ul.com/wp-content/uploads/2015/05/Roof-Ratings-21.pdf

Class A, B, and C Roof Ratings Helpful hints for achieving code compliance Questions often arise about the construction needed to achieve a Class A, B, or C fire rating for a roof assembly. The information needed to achieve code compliant installations is included below. What are these ratings? The UL 790 (ASTM E 108) Standard Test Methods for

sfm.dps.louisiana.gov/doc_flamespread.html

Exterior wall construction can be classified by its fire-resistance. A fire-resistive rating is the time that exterior wall construction can withstand fire exposure as determined by a standard fire test. Wall construction can be classified as 4-hour, 3-hour, 2-hour, 1-hour and non-rated construction.

newceilingtiles.com/pages/tiles/fire.html

Genesis Tiles & Grid are all fire rated Class A (1). Hour Ratings. A "one-hour" or "two-hour" fire rating is given to an assembled building component, such as the entire suspended ceiling system, that can resist fire exposure for that length of time. Building codes stipulate the "hour rating" required for various types of building use.