I'm currently running a 4 card mining rig with powered pcie 006c risers and a 1200W high quality Corsair PSU. The GPUs run at around 69C when mining.
However I was just wondering if there were any fire risks associated with the rig and if it is safe to have the rig running 24/7 next to the walls in my house (drywall).
I know this is probably being over cautious but am just making sure. Thanks

Drywall is "fire resistant" rated.
Your rig could burst into flame and it would die out before the drywall had issues.