Many fire stop systems call for the use of a steel sleeve with fire putty or fire caulk to maintain the fire rating of the wall. You have two basic choices. Many are using pass through devices that come fully loaded with fire stop products, you simply install and run your cable. While these really are nice and fool proof to use however…. adding twenty 2″ sleeves at close to $150 a piece can really change the look of your quote. Many contractors opt for a piece of emt cut to about 12″ with Arlington hammer on bushings and fire caulk. It is important to have a cut sheet from your fire putty or caulk manufacture showing a system using a steel sleeve and their product. Keep a copy on file at the job and make sure you follow the recommended fill rate.
You can find pre cut EMT pipe from 1″ up to 4″, deburred and ready to install with Arlington EMT bushings at ConstructionFastening.Net. You can really see the advantage of buying your EMT pre cut when you start using larger sleeves, especially in 4″ diameter. 4″ EMT is not readily available at you local big box store and if you need 2 sleeves, you buy a full stick, then you need to track down the bushings. Then add to the frustration of cutting larger EMT. Give our pre cut EMT a try and you will see why they are one of our top sellers.