Thank you so much for insightful explanation. That clears up a lot of confusion for me. Based on what you explained, I do want to point out that the answer provided in the PDD practice exam Form 1 question 66 is not exactly correct (see attached). The correct answer should exclude smoke damper as HVAC ducts penetrating RATED partitions are required to use fire damper only. This question really had me confused…
To summarize the points you made, please confirm the following:
-Fire damper (RATED) only applies to penetration at Rated walls/partitions (fire walls, fire barriers, fire partitions, and smoke barriers).
-Smoke damper (NON-RATED) should only apply to smoke partitions as they’re also not fire rated.
However, the information from IBC has some discrepancies from your explanation about smoke barrier, and fire / smoke dampers. IBC 717.4 and 717.5 mentioned that there is a combination fire/smoke damper, or providing both a fire damper and a smoke damper. IBC 717.5.5 also states that smoke dampers shall be provided at penetrations of smoke barriers (this is where you said it should use fire dampers instead). Please help clarify this.