Once you have the up duct in hand you will see the clips that will clamp the diffuser section firmly into your dry wall.
You must raise the clamps against the spring pressure into the “cocked” position.
Now push the up duct metal-body threw the ceiling hole, up into the attic so that you can put your up duct face, flush against the ceiling.
As you firmly-press the diffuser, flush to the ceiling sheet-rock, the spring loaded clips will “strongly” snap closed, sealing tight.
Alright, now your Easy-Seal Up Duct is installed and you are well on your way to increased comfort, efficiency and saving money.