Retrofit microwave exhaust

I currently have an extractor fan above my stove but have purchased a microwave with exhaust to replace it. The microwave outlet is rectangular and whist I know I can get a rectangular to round adapter my issue is that my round exhaust pipe is off center (no idea why it was installed like that). There is an offset on the pipe to line up with center but this offset is too low to work with a rectangle to round adapter. My questions are what hardware do I need to replace to make this work and should I be concerned about the tape on the existing pipe containing asbestos, the house was constructed in 1975. Please see linked photos.
http://i.imgur.com/q6le5bV.jpg?1
http://i.imgur.com/nRzr2NQ.jpg
http://i.imgur.com/LUUakBl.jpg

Thank you

 

I have no idea if the tape contains asbestos. I wouldn't be concerned and technically this tape is not approved for duct work.

You have no choice but to use a 3.25 x 10 x 7" adapter.

I do this all the time, it takes patience. Purchase the adapter and Two 7" round adjustable elbows.
You will use 1 elbow to get the duct from the ceiling pointed in the right direction. There will be gaps.
Cut sections out of the other elbow to cover the gaps. They will be kind of pie shaped, cut out the sections at the narrowest part.

Tape all this with metal duct tape.
You should also use a dremel or other tool to cut your pipe coming out of the ceiling closer to the ceiling, giving you more height to work with.

Note: before installing microwave, be sure to rotate blower assembly up. The ovens are shipped to vent out the front.

 

Thank you for taking the time to respond, I have no doubt what you are saying is correct but I am having a hard time imagining in my head how I could use a 90 degree bend "to get the duct from the ceiling pointed in the right direction". I am sure it is my inexperience but could you elaborate on that a bit more or even find a photo that would help?

I really appreciate your efforts to help.

 

The adjustable elbow is not 90° (although it can be), it has sections that can be rotated into many different angles. It's a little puzzling if you've never done it before. Purchase the elbows and play with them to see all the different angles you can get.

 

Got it now, thanks again.

 

A tip: Don't try to install the duct with oven in place, it's much harder. Get everything aligned before installing the oven.

 

Understood, I will be back with photos if I get stuck or succeed