NBaxter

Hi all I am a new owner of a 2017 TC swb. I really like the van so far but I am going to try and lessen the noise from the back into the cab by putting some sound insulation foam and deadener on either side of the bulkhead. My question is, what's the purpose of the vents in the bulkhead and are they really needed for a work van? Obviously my soundproofing would be greatly improved if I could cover them! Any help would be much appreciated Nick