Steel Duct

Penetration Item (Size and Type)

Sleeve
O = Optional
R = Required

Point Contact

Assembly Thickness

F Rating

Nelson Product

UL System

Nelson FS Drawing

4" diameter 28 GA      10truss 1or2 LBS3 F-C-7027 FS-0561
6” X 10" 24 GA      10truss 1 LBS3 F-C-7028 FS-0562
6" diameter 30 GA    X 10truss 1or2 ES1399 F-C-7020 FS-0408
24"X 7" 26 Ga Vent or 16 GA Grease Cuct, Insul.      10truss 1or2 ES1399 F-C-7036 FS-0655