Security grilles and burglar bars are covered by Title 24 , Section 1008.1.3.5 of Part 9 and Title 19, Section 4.1 et. al.  The main point to remember is that any of these devices placed on windows need to be of a break-away type to allow emergency egress from the inside.  There are some limitations Read more about What section of code covers burglar bars or security grilles on windows?[…]