Grain Systems PNEG-1874 - Manual (Page 51)

6. 18' Offset and Roof Hatch Platform Installation Instructions
PNEG-1874 18' Tower Dryer Fan Style Catwalk Assembly 51
Installing Knee Support (GT1-2039-BS)
1. Install the knee support (GT1-2039-BS) around the dryer between the catwalk support clips
(GT1-2040-BS) and the planks (GT1-2033) using 3/8"-16 x 1" YDP grade 8 or grade 8.2 bolts
(S-7927) and 3/8"-16 ZN grade 5 nuts (S-968).
(See Figure 6S.)
Figure 6S Knee Support (GT1-2039-BS) Installation for Offset and Roof Hatch Catwalks