PROBLEMS FACING IN PROJECT

PROBLEMS FACING IN PROJECTWe are getting the temperatures of the Heatsink in the desired range.The problem we are facing is, SMPS (750W)is not getting meshed if I keep it as Hollow block and add openings or grille on either sides to pass the air flow through it.See the attached image for better understanding.Error is being displayed when openings or grille created on GPU (175W). Mesh not created on GPU Body, but if we dont create openings or grille, temperate is too high.Please help us to resolve these two issues, so that SMPS and GPU temperature is in range