What size register for an 8 inch flex duct?

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The boot is 4″ x 12″ x 8″. Is this the correct size register ffor an 8″ flex duct? Size of the supply run (duct), boot and register is determined by how much air you need. And what kind of throw the register is to give. Depending on model of floor register. It could allow an air delivery of 75 to 250CFM. Or 65 to 210 for a different type.

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