[Linked Image from aifittings.com]

If you notice from the page they are CSA certified but not UL listed. Some AHJ’s would reject them based on this. I have had inspectors accept them in non-rated walls but not firewalls. What that decision was based on I am not sure. A call or e-mail to Arlington’s tech support could answer all your questions. If you do, and get an answer, be sure to post back here so we can all learn the outcome.