Check out different sizes of networking/server racks/cabinets from 1U to 16U here:
https://www.indiamart.com/proddetail/network-racks-4u-to-42u-19668546648.html
https://dir.indiamart.com/bengaluru/networking-rack.html (bengaluru)
D-link alsmo manufactures the same. Side door is useful for wall mount racks.