Help picking right chimney cap

[Nerd]

Hi Guys,
So I'm at my parents' and noticed they have NO chimney caps anymore...I'm utterly shocked this hasn't caused a problem. Anyway.... the one that has me asking questions is the 8" round chimney liner. I don't know the brand. I bought a beautiful 8" DuraVent cap that alas doesn't fit because it matches the diameter of the liner exactly.

I'm not entirely sure what to do. Should I finagle the Duravent cap on there with some sheet metal and hose clamps or is there a type of cap meant for this liner (something slightly over or undersized)? Again, I really wish I knew the liner brand...

The rectangular ones look like they'll be fine with the generic home depot caps (they are more forgiving size-wise). Those chimneys are just the furnace and unused fireplace upstairs.

Thanks for your help guys! I ran a brush down the liner today for good measure. As you can see we're still burnin' coal here in western Pa.

 

[Ctwoodtick]

First thing I’m seeing, and then asking myself, is what is that “crown” made of.? Looks like a sheet of cement board. I would see what the pros on here think of that first before thinking about the cap for now.

 

[Nerd]

First thing I’m seeing, and then asking myself, is what is that “crown” made of.? Looks like a sheet of cement board. I would see what the pros on here think of that first before thinking about the cap for now.

Yea I’m not sure what went down there. I gotta touch up that whole top this spring anyway. Most pressing thing (and easiest to fix) is the cap at the moment. I ordered a cap meant for single walled liners with a clamp on it so that should take care of that for now.

Some sparks came out when I had the ash tray open to dump the ashes, so I was hoping to get a spark arrester type like the Duravent one (which is actually meant for the double walled liners I’ve learned, but it sure was a beaut).

Got two of the caps on!

 

[Ctwoodtick]

Yea I’m not sure what went down there. I gotta touch up that whole top this spring anyway. Most pressing thing (and easiest to fix) is the cap at the moment. I ordered a cap meant for single walled liners with a clamp on it so that should take care of that for now.

Some sparks came out when I had the ash tray open to dump the ashes, so I was hoping to get a spark arrester type like the Duravent one (which is actually meant for the double walled liners I’ve learned, but it sure was a beaut).

Got two of the caps on!

View attachment 322126

Make sure that any future spark arrester stays clean do it doesn’t cause lack of draft.

 

[Nerd]

Make sure that any future spark arrester stays clean do it doesn’t cause lack of draft.

Yep good advice