Need advice regarding hooking up my Harman P61 to flexible chimney liner.

[SciGuy]

I was lucky enough to find a 4" M-Flex chimney liner kit on Craigslist for $50 to use for an "in front of fireplace installation" of a used Harman P-61A also acquired via CL. The chimney now has ~18' lined with the flex pipe. I mixed perlite with portland cement to fill roughly the bottom third of the flue and then poured in loose perlite for the top 2/3 to make it easier if some future home owner wishes to remove the stove and recommission the stone fire place for its original purpose.

At this point I need to make a connection between the 4" flex pipe and the Harman. The Harman output is 3.5" while the flex pipe came with a 4" X 3.125" reducer. Obviously there needs to be a 90* change of direction as well as connection between the two fittings. We're trying to do this installation safely as well as user service-ably while being a frugal as possible. Below are a couple of photos to help consider the situation.

What do I need to do this connection? Is a T in the system essential or at least highly recommended?
Can I j make a 90* turn with the flex pipe?

Thanks for any informed replies.

Hugh

 

[railfanron]

I have a 4" tee at the bottom of my 4" flex and then 3 inch duravent piped to it from the adapter. There is no insulation in the space between the flex and stainless wood chimney. The advantage to a tee is no extreme bend in the flex.
Ron

 

[SciGuy]

I have a 4" tee at the bottom of my 4" flex and then 3 inch duravent piped to it from the adapter. There is no insulation in the space between the flex and stainless wood chimney. The advantage to a tee is no extreme bend in the flex.
Ron

Ron, Thanks for the reply. I now find myself having a difficult time finding information regarding the specific duravent appliance adapter part number needed to work with my P61 A. The output measures very close to exactly 3.5" . I think with the adapter plus 1' of Duravent pipe running into a 4" X 3" T ought to fill the bill. So can you hold my hand and lead me to the proper appliance adapter to work with Duravent pipe.

Thanks,

Hugh

 

[railfanron]

I got the adapter from my Harman dealer. I also used 3" Duravent I believe. I got a slip tube piece of Duravent that could slip 3" I believe to get the final fit. I may be wrong on this. It was 4 years ago.
Ron