What are the advantages of introducing make up air into the kitchen through the perforated supply plenum attached to the CKV hood or installed in the ceiling?

Several advantages are listed below:

1. Perforated Supply Plenums have the potential to provide a large diffused area for the return of the make up air, thus facilitating a potentially lower air speed of the make up air returning into the kitchen.
2. Potentially Simplifies the Design and Installation processes by eliminating the need to engineer a makeup air diffusor system with multiple diffusors thought put the kitchen.
3. Potentially lowers the cost of the make up air system and the installation of it by eliminating multiple duct runs and diffusors.