In regards to LSC 220.127.116.11 (2) What would be considered "fully-ducted" penetrations in smoke barriers? Does this require metal ductwork, or would flex-duct also met the requirement. Thanks.
The image below I believe is the best visual I share for a fully ducted system. You have a duct that supplies the air to the room and then a duct that returns air to the HVAC unit.
Are you asking if you need a damper/s? Well you may not if the attic is also sprinklered, in Texas the HVAC system also has to shut down upon activation of the fire alarm.
I dont think any AHJ will be "ok" with using flex duct penetrating a smoke barrier. All the ducts I have ever seen penetrating a smoke barrier have been metal wrapped in fiberglass.
While i understand you may want to save money on certain things when lives could be put in jeopardy you may need to spend a little more.
Also you will need to seal the opening around the penetration with something rated the same as the wall or greater. ( 1 layer/sheet of gypsum board (sheetrock) is 30 minutes most smoke barriers are 2 one on one side of the smoke barrier and one on the other (think of a basic wall))
Do you have pics that maybe you could post to better understand your situation
-LSC Inspector for Texas HHSC/CMS
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