How to Plug a big hole?

We have a hole between floors that must be about 3 inch by 16 inch, that allows the 100 pair telephone cables to pass between the electrical room on one floor to the same room on the floor above and below. This is just an open hole, no fire stop or anything. I would like to put something in it to stop the air from flowing thru to the next floor, so that drywall construction going on on one floor doesn't fill the other floors up with dust. I was thinking of getting some rags or plastic and stuffing it in there. Is there something that I can use that will work that's removable so that next time a cable needs to be run, it won't require a hammer and chisel or drill? Thanks.

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Posted 5 years ago by Watson A.Name - "Watt Sun, th in LAN and Telecom Cabling

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