The 270 frames-long vdb dust sequence has a Fade-In and Fade-Out animation and has a large motion surface to fill the whole scene with dust. It moves from one side to other.
$18
The 402 frames-long vdb dust sequence has a longer frame range and has a faster permanent motion.
$18
The 256 frames-long vdb sequence has a permanent motion, is looped and can be animated in Blender endless. It moves from one side to other. The sequence is ready for the VDB Loops Addon!