Max. 4" Steel pipe or max. 2" EMT, steel conduit, or copper pipe with 3/4" AB/PVC flexible foam insulation (such as Armaflex) through steel sleeve 1-hour FS ONE WL5016
Max. 2" steel pipe, EMT, steel conduit, or copper pipe with 1/2" glass fiber insulation or 3/4" AB/PVC flexible foam insulation (such as Armaflex) 1 or 2-hour FS ONE FC5004