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Air Handling Unit
Installation, Operation, and Maintenance Manual
April 2021
12.8 Field Penetration for Electrical Wiring
Determine size and location of penetration from
outside of air handling unit.
Drill, then hole-saw desired hole in proper location
first from outside of unit.
Repeat process on interior skin from inside unit.
Make continuous putty ring on two reducing washers.
One for outside of unit and one for inside of unit.
Continued on next page.