| | Contractor | Address | Phone |
| HAFSC | Kasco |
226 E. Hudson, Royal Oak, MI
| 248-547-1210 |
| HAFSC | Midwest Firestop |
132 Beechwood Hills, Newport News, VA
| 757-243-8434 |
| HAFSC | National Firestop (US) |
3031 W. Grand Blvd, Suite 618a, Detroit, MI
| 248-521-0931 |
| HAFSC | Northwest Firestop |
6419 Monroe Street, Sylvania, OH
| 419.517.4777 |
| HAFSC | Superior Industrial Insulation Company |
3855 West 150th St, Cleveland, OH
| 216-252-9590 |