Grain Systems PNEG-707GSI - Manual (Page 58)

5. Plenum Roof
58 PNEG-707 12', 18', 24' and 30' GSI Commercial Tower Dryer
Snug bolt tops of plenum roof rafters to plenum roof center collar. Use 3/8" x 1" hex head galvanized
bolts and nuts.
Snug bolt bottoms of plenum roof rafters in pairs of bolt holes along top of eave channel. Use
3/8" x 1-1/4" grade 8 hex head bolts and nuts. (3/8" Galvanized washers as needed.)
2. Snug bolt two (2) more plenum roof rafters to plenum roof center collar. Orient to bolt holes in
plenum roof center collar as shown in Figure 5Z .
Figure 5Z
3. Install remaining sixteen (16) plenum roof rafters to plenum roof center collar as shown
in Figure 5AA .
Figure 5AA
4. Level plenum roof center collar.
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