Clearance for rack mount amp n a solid shelf?

diyAudio Member
Joined 2007
Just picked up a NOS Peavey PVi 2000 for subwoofer duty in the home theatre.
It won't be rack mounted.
How much clearance is needed underneath the amp if any?
Wooden shelves in an IKEA unit.
Should I add solid rubber feet on use aluminium T strip if some clearance is needed?