Originally Posted by Derf00

Apparently you guys don't understand what DOT means in terms of "safety" i put it in quotes because DOT approved plastic and glass has to meet or exceed certain federal regulations for impact strenght and breakage charateristics. Safety is a relative term because you can still get injured from glass and or plastic that is DOT approved and broken

For example DOT glass must have certain characteristics when it break, no large shards, layer of film or plastic in the middle to keep it together even when it shatters etc.. Shope have the right to refuse installing anything that takes away from federaly regulated safety or emissions laws. If they do install the plastic or glass component and you get injured because something highly unlikely but still possible happens, you can sue them and the shop can lose their business license.

Insurance companies look at those details (DOT approved parts) in cases of accidents that involve the item in question. Again, highly unlikely you'll have any problems but there's always a possiblity.

In a nutshell the shop is covering their ****. If you get into an accident and are potentially injured from installed said louvers, you and or the insurance company could go after the shop for negligence.