Equipment Screens

We are bidding on a commercial roofing project and the GC has asked us to put in a bid on the rooftop equipment screens as well. We haven't done that kind of work before and this is the first time a GC has asked for it. Do any of you provide bids on equipment screens when you bid a commercial roof that has them? If not, do you know what trade normally bids them?

Thanks.

Yes, we've built them...GC should be able to provide a specs...should be on prints...Sometimes steel...sometimes wood