Clean out on 503 Hitzer ???

I have recently purchased a hitzer 503 insert and had it installed. The fireplace it was installed in is actually a two sided fireplace which also gives me access to the back of the stove also. The chimney runs through the middle of the house and is 15 feet tall. It is brick with 20x20 flu liners. With this size of flue i ran 6 inch forever flex 316ti from the appliance connector to rain cap. There is a little dog leg in the liner but it is pretty much vertical as you can see in the photos. My question is where is all the fly ash going to end up? In the stove???? or will it get sucked up in the chimney???? Should i put a cleanout somewhere? Any help will be greatly appreciated!!! Thank you

Do you have enough room to come with a T right off of the stove. If you do you can connect the flex pipe to it and you could have a cap on the side of the T facing the back and you could use that to check if anything accumulates periodocally during the heating season. If need be you can remove the cap and check it with a mirror and flashlight to see if it needs cleaning.

Yep, I think buck hit on your only option. Your set-up is looking good my friend.