6"x 6" (Duct Opening Size) 4-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 7.75" X 7.75" This yellow epoxy-coated gas connector

This yellow epoxy-coated gas connector with fittings is designed for maximum safety

The Listed size 6'' x 6'' is for inside duct opening measurement

actual outside dimension is 26

In this example

6"x 6" (Duct Opening Size) 4-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 7.75" X 7.75" This yellow epoxy-coated gas connectorThe Listed size 6"x 6" is for inside duct opening measurement, actual outside dimension is 7. 75" X 7. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Four Way Air Flow deflection Design Multi shutter damper with easy handle to adjust desired amount of air flow Individually shrink wrapped with card board pad in the back for extra protection