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.
AMR (Audio Modem Riser), CNR (Communications and Network Riser) and ACR (Advanced Communications Riser) are slots that you can find on your motherboard that have the same goal: to install HSP (Host Signal Processing) devices to your PC. These devices can be modems, sound cards and network cards.