An access panel is installed on a round sheet metal duct with an opening sized up to twelve inches by one-third of the circumference, not to exceed twelve inches. A gasket seals the perimeter of the removable panel against the duct wall. Sheet metal screws secure the panel flange evenly around the opening.
NOTES: 1. "C"=1/3 CIRCUMFERENCE NOT TO EXCEED 12" GASKET 12" OPENING SHEET METAL SCREW "C" OPENING
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