Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Fire-Stop Ratings

F-rated, T-rated and L-rated fire-stop systems.

Sponsored Links

Openings for electrical and HVAC installations in smoke and fire-rated constructions must be sealed to resist the passage of heat, fire and smoke.

Fire stop systems are typically categorized according through-penetration of

  • flames
  • temperature
  • smoke

Ratings according ASTM E814, "Fire Tests of Through Penetration Fire Stops" are

F-rating, Flame Ratings

The F-rating is expressed in hours and the number indicates the specific length of time that a barrier can withstand fire before being consumed or before permitting the passage of flame through the opening.

A F-rated opening shall also withstand a hose stream test.

T-rating, Thermal Ratings

The T-rating is expressed in hours and the number indicates the length of time that the temperature on the non-fire side of the penetration does not exceed 325 oF (163 oC) above the ambient temperature. This ensures that the temperature on the side of the wall away from the flame does not reach the flash point of any materials on that side of the wall.

L-rating, Smoke Ratings

The L-rating is the amount of air (or cold smoke) that can leak through a penetration and the number indicates the amount of air in cubic feet per minute.

L-ratings are tested with a differential pressure of 0.30 inches water column (75 Pa) at 75 oF and at 400 oF.

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2005). Fire-Stop Ratings. [online] Available at: https://www.engineeringtoolbox.com/firestop-rating-d_923.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 30

Sponsored Links
.