I am in the process of finishing my basement and I want to put a home theater with a front projector in the family room. I am planning out where to run a 2" PVC conduit with the video cables in it to the projector. One area that I am considering is parallel to a HVAC vent that will be framed in. There will be about a ten inch drop by 15 inches wide. Also in this drop area runs the main power line to the house. Will the Air Conditioning Power cause any interference to the video cables? Alternatively, I can run the conduit through the I-Joists. How big of a hole can I run through the I-Joists. Would a 2-21/2" hole violate building codes? Thanks for any help you can provide.