Noise Reducing Server Rack Taller than 25U?

My company manufacturers a line of server racks that reduce noise, but the tallest we have is 25U.

We receive an occasional inquiry for a noise reducing rack taller than 25U (usually full height of 42U or 45U), but we are not sure how much interest there would be.

Does your company or any companies you know put more than 25U of equipment close enough to people (employees, customers, patients, etc.) to where a 42U or 45U rack that reduces noise would be needed?

Thanks,

Ken