FAT32 works for both OSes, but has a 4GB size limit per file, so it isn't ideal. However there is a 4GB file size limit. You could use NTFS but you will have to install additional software on the Mac in order to read AND write to the volume. exFAT then is the best option.
The riser duct is a problematic zone due to: -build-ups, alkali infiltration and chemical attack to the steel anchors. Following the general rule, we suggest lining the duct with bricks in the round sections and with castables in the square sections.
Premier Conduit's riser conduit is used for effective cable and fiber optic management within interior raceways. Premier's riser conduit is a flexible, non-metallic, corrugated raceway. As I was walking up the stair /n I met a man who wasn't there /n He wasn't there again today. /n I wish, I wish he'd stay away.