Dryer exhaust penetrating 1 hour assy.

[Badeeba]

Does anyone have a solution for a dryer duct from a B occupancy penetrating a 1 hour assembly into an open parking garage? Section 504 of the 2006 IBC appears to eliminate dampers as a solution, where would you terminate the 26 guage duct that is allowed to penetrate the wall? Looks like it can't be done...

 

[mtlogcabin]

Re: Dryer exhaust penetrating 1 hour assy.

Is it a concrete or masonry wall? Maybe exception 1 might help

712.3.1 Through penetrations.

Through penetrations of fire-resistance-rated walls shall comply with Section 712.3.1.1 or 712.3.1.2.

Exception: Where the penetrating items are steel, ferrous or copper pipes, tubes or conduits, the annular space between the penetrating item and the fire-resistance-rated wall is permitted to be protected as follows:

1. In concrete or masonry walls where the penetrating item is a maximum 6-inch (152 mm) nominal diameter and the area of the opening through the wall does not exceed 144 square inches (0.0929 m2), concrete, grout or mortar is permitted where it is installed the full thickness of the wall or the thickness required to maintain the fire-resistance rating; or

2. The material used to fill the annular space shall prevent the passage of flame and hot gases sufficient to ignite cotton waste when subjected to ASTM E 119 time-temperature fire conditions under a minimum positive pressure differential of 0.01 inch (2.49 Pa) of water at the location of the penetration for the time period equivalent to the fire-resistance rating of the construction penetrated.

 

[Builder Bob]

Re: Dryer exhaust penetrating 1 hour assy.

I am not sure if it can be done as described based upon IMC 501.2 Exhaust discharge and 501.2.1. This leads you to 504.4 which requires the duct to terminate "outside" the building. Terminating hte duct exhaust into the open parking garage doesn't meet the intent of the code IMHO.