Product review (1 stars): Do not purchase this!
Not worth it!  The item was received with dents due to poor packaging, and is also missing the top part (the straight part that connects to the outside vent).  The material is very flimsy and has very large gaps everywhere - even places that were welded. The weld jobs looks like a 1st grader had a field day making random spot weld points.  I am not going to return this since I can modify it to make it work for my needs (using a lot of aluminum tape and metal shear), but I definitely would not recommend this piece of overpriced junk.