Step 6Mating
First we need to prepare a place for the grate. Take out your drill, and drill a few (3-4) holes around the circumference of the can about half an inch above where you cut the hole for the duct. Screw in a few short screws, these are for the grate to rest on.
Now we need to modify the duct so it can be riveted or screwed onto the can. Use the can to mark an arc line on the wider side of the duct opposite the seam. Then add two more lines perpendicular to the edge for a flap. (see picture below) After cutting along these lines bend the flap out perpendicular to the duct.
http://static2.instructables.com/pub/FPH/K3EE/FPHK3EE4U7EQHO9252.medium.jpg
Then cut two flaps out of the sides of the hole that you cut in the can for the duct, and bend them both out too.
Drill through the top flap and the two side ones, through both the can and the duct. Put the flap on the top side of the duct inside the can. Place the holes together and insert a pop rivet, or screw.
http://static2.instructables.com/pub/FLK/7595/FLK7595GYXEQHO9296.medium.jpg
You can now place the grate down inside the can, resting on the screws...
Then you need to stick the adapter and the other end of the duct together. Doing this is very similar to the other end of the duct. Just drill a hole through each flap and place a rivet or a screw through it.
That's it :D
Just tape the adapter to the blower and your done.
Kick back and view your handiwork.
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