My warm-air ciculation system is located in my basement utility room, and is attached to the ceiling joists by four short metal chains and four screws. So, the fan's enclosure is hanging from the ceiling joists and can't be moved too far because of the ducts and pipes running in and out of it.

My problem is that the vibration from the fan can be felt through the floor directly above it. Anyone laying on the floor above the fan can feel the vibration (and gets a very small massage in the process). It's not a small area that you can feel it, it's the entire family room floor.

I am wondering what types of solutions/materials would be good for dampening or eliminating the vibration transfer of the fan to floor? And would it even be possible to eliminate all the vibration if I wanted to go that far?