Bdubs said:

I do it. I made a cardboard box tapered down to a 6” vent hose and it blows out. No problems here. The radiant heat is still a couple degrees or more added to the space while running. I am sure that mine has more radiant with cardboard used. If you could get ahold of aluminum and shape it and seal it, you would substantially be able to reduce the radiant heat coming from the material used for the box.

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