DVL to Support Box - Normal or needs attention?

[highanddryinco]

- Happy owner of PE27.
- All hearth/stove work done myself.
- Clearances well beyond requirements. (No, not with the plastic plant wifey has next to it for summer mode)
- Flu/Chimney work hired out to one of local stove company main installers. Very knowledgeable. Provided many references. Very reputable local stove shop.
- Permitted, Inspected. (What a waste of $350. Gentlemen knew not of what he was looking at. Inspected roof from the ground. Inspected chimney from the attic access 25' away with flashlight. However, I've now got that official piece of paper on file in case anything bad ever happens.)

18' from floor to flat ceiling where I have the stove installed. Roughly 15' of 6" DVL double wall from stove to support box with a perfectly straight run, no jogs.

Check out the small gap in the photo of where the DVL meets the ceiling support box. When cool (i.e. no fire) obviously the pipes are contracted and this gap is there. Also though, I can rattle the DVL back and forth maybe a quarter inch or so. Internal connector appears tight in the support box as it doesn't move. Just the DVL on the connector moves.

Within a few minutes of firing, pipes expand and everything is snug as a bug again.

Should this be a concern for me?
I could certainly tighten it up when cold by, removing screws, sliding the slip coupling until tight, and then re-install screws at that length. But would that be an issue when that 15' of pipe heated up again?

I'll get in touch with the installer before fall but first I'm curious what you all think or if you've seen this.

 

[webby3650]

What you have is perfectly normal. No need for concern.

 

[webby3650]

That adaptor actually snaps into the box as well as the DVL. Sometimes it doesn't snap in all that well to the pipe, so we usually pre-drill and screw the DVL to the adaptor with SS screws.
The new DVL adaptor doesn't snap in. It's a smooth SS adaptor with a trim piece that screws directly to the box. I prefer to screw the pipe to it, so the gap is never seen, even though it should never be an issue on a straight run.

 

[velvetfoot]

I'm putting in some DVL now. I think I might have a different ceiling support box.
I have this one:

,
while I think you may have this one:

I don't understand why there isn't a screw in that hole in the picture on the right. In my support box, a screw goes through a slot in the support box's dvl and into that hole.

I'm having a little issue whee the liner isn't coming down exact straight, and the ss connector sleeve winds up being a little crooked, but I think it still makes good contact.

Did he put any sealant in there?

 

[highanddryinco]

That adaptor actually snaps into the box as well as the DVL. Sometimes it doesn't snap in all that well to the pipe, so we usually pre-drill and screw the DVL to the adaptor with SS screws.
The new DVL adaptor doesn't snap in. It's a smooth SS adaptor with a trim piece that screws directly to the box. I prefer to screw the pipe to it, so the gap is never seen, even though it should never be an issue on a straight run.

Thanks for that Webby. Makes sense. Wish I would have been here the day the installer made that connection to see it up close.

 

[highanddryinco]

I'm putting in some DVL now. I think I might have a different ceiling support box.
I have this one:

,
while I think you may have this one:

I don't understand why there isn't a screw in that hole in the picture on the right. In my support box, a screw goes through a slot in the support box's dvl and into that hole.

I'm having a little issue whee the liner isn't coming down exact straight, and the ss connector sleeve winds up being a little crooked, but I think it still makes good contact.

Did he put any sealant in there?

I would have to say there's in no sealer there and I think the crooked is just coming from my camera angle. Everything is pretty square by eye.
I asked him to use the tall square DuraTech support box. I like the look and then there's no need for an additional insulation shield up in the attic. But instead of the adapter with the trim ring that you pictured, I think he simply used the plain snap in SS adapter and ran the DVL up to it as it protrudes from the support box. Just guessing but on further inspection I'm guessing if theblack trim ring was installed, I'd be seeing exactly what most other folks see on theirs. That would take the little wiggle out of the pipe and I'd never see the expansion gap. Sound feasable?
As far as the screw hole, there's nothing there but air until you get to the inner wall. Like you mentioned, I think it would come into play with the first adapter you have pictured.

Thanks for the great support. I've been watching this site for a little while. Good people here.

 

[webby3650]

I'm putting in some DVL now. I think I might have a different ceiling support box.
I have this one:

,
while I think you may have this one:

I don't understand why there isn't a screw in that hole in the picture on the right. In my support box, a screw goes through a slot in the support box's dvl and into that hole.

I'm having a little issue whee the liner isn't coming down exact straight, and the ss connector sleeve winds up being a little crooked, but I think it still makes good contact.

Did he put any sealant in there?

I have never seen the support box that you have pictured. Are you sure that a picture of your support? And not an adaptor? And no sealant needs to be used on DVL.

 

[velvetfoot]

I guess I mispoke. It does support the dvl since it hangs off there. That picture is from the duravent catalog.

 

[Heatsource]

I have never seen the support box that you have pictured. Are you sure that a picture of your support? And not an adaptor? And no sealant needs to be used on DVL.

thats the new dvl pipe adapter, replaced the close clearance connector (like the one use in the OP)
the funky cc connector must have been old stock, they haven't made them in quite a while now

 

[highanddryinco]

Just for clarification...This is the 6DT-CS24 support box and the 6DVL-ADC adapter charged out on my invoice.

 

[webby3650]

thats the new dvl pipe adapter, replaced the close clearance connector (like the one use in the OP)
the funky cc connector must have been old stock, they haven't made them in quite a while now

I knew that they changed it once. The old one just pushed and locked poorly, then the new one has a flange that screws to the box securing the adaptor. They have changed it again?

 

[chargervp]

Just for clarification...This is the 6DT-CS24 support box and the 6DVL-ADC adapter charged out on my invoice.

Newbie question here. My 6DVL-ADC doesn't have any notches like the one above.

So the adapter slides into the support box, but how would my piece of telescoping dvl attach to the bottom of the adapter? I don't see how it can screw to the adapter. Am I missing something?

 

[Highbeam]

It snaps in. There is a little groove in the DVL.

 

[Hoozie]

I was just going to bump my chimney thread with this same question.

My DVL (45° piece) sits very loose in the 6DVL-ADC adapter. It doesn't snap in or hold itself at all. I'm planning to take it back and order the 6DVL-ADT adapter instead.

Also, to screw the DVL to the -ADC adapter, it looks like you have to drill through the inner shell, then into the adapter, and then use a ~1"+ screw?

 

[chargervp]

I was just going to bump my chimney thread with this same question.

My DVL (45° piece) sits very loose in the 6DVL-ADC adapter. It doesn't snap in or hold itself at all. I'm planning to take it back and order the 6DVL-ADT adapter instead.

Also, to screw the DVL to the -ADC adapter, it looks like you have to drill through the inner shell, then into the adapter, and then use a ~1"+ screw?

Hoozie- I came up with the exact same plan last night. I wasn't happy with the fit up of the -ADC and to screw it you need to go through the inner liner, so I ordered up the -ADT adapter so it will be screwed together by design.

 

[webby3650]

I push the pipe up over the adaptor, predrill and secure with 1"SS screws. It works fine and here are no issues with securing it this way.

 

[dangerous]

Wow, I'm glad I found this conversation. Yesterday I completed the installation of a wood stove, using the DuraPlus Manufactured Home Kit #9086 (chimney sections, cap, support box, etc) which also came with the 6DVL-ADC #8678 close clearance adapter (the new version which is smooth [no notches] and is held onto the support box with metal screws through a trim ring.

I did the same thing as y'all ... attached the adapter to the upper piece of DVL pipe with screws (long enough to penetrate the adapter), then attaching the DVL pipe + adapter assembly to the support box with screws through the adapter ring.

Then I got to thinking ... ... how does this work?

The adapter slips snuggly into the inside of the end of the DVL pipe. If you look down through the adapter, the airway openings between the double walls of the DVL pipe are exposed. At the other end of my stove pipe, at the stove vent, I have a DVL appliance adapter that allows room air to go up into the double walls of the DVL pipe. So it looks like room air would go up between the double walls until it reaches the adapter, then gets dumped/mixed into the central 6 inch exhaust/smoke/soot air stream to continue up the chimney exhaust.

This leads to three questions:

1) Is this supposed to happen?
2) Can cresote/soot drip/fall down the chimney, past the adapter, and go down the air channels between the DVL double walls?
3) Does the support box (with its integral chimney pipe adapter in the bottom, allow "fresh" air to enter the double walls at the bottom of the chimney pipe(s), or are the air channels between the chimney pipe(s) essentially sealed?

I am "Dangerous"

 

[begreen]

Sounds odd. Have you called DuraVent tech support?

 

[Highbeam]

Are you assuming or did you verify that the air space betwen the walls is continuous through each joint? Obviously there needs to be some sort of connection between the inner and outer walls at each joint but does that connection allow or prevent air flow?

 

[greythorn3]

heres a picture of how mine goes togeather, i have that thin inner part i screwed to the lower dbl wall also. is there something newer then this setup? seems to work good for us anyhow.

 

[webby3650]

heres a picture of how mine goes togeather, i have that thin inner part i screwed to the lower dbl wall also. is there something newer then this setup? seems to work good for us anyhow.

View attachment 140610

They have upgraded the adaptors twice since yours. Yours is just fine, the new on is nicer to install and easier to figure it out.

 

[greythorn3]

do you have any part numbers for the new ones? i may be doing an addition that will get my bk princess soon.

 

[webby3650]

Wow, I'm glad I found this conversation. Yesterday I completed the installation of a wood stove, using the DuraPlus Manufactured Home Kit #9086 (chimney sections, cap, support box, etc) which also came with the 6DVL-ADC #8678 close clearance adapter (the new version which is smooth [no notches] and is held onto the support box with metal screws through a trim ring.

I did the same thing as y'all ... attached the adapter to the upper piece of DVL pipe with screws (long enough to penetrate the adapter), then attaching the DVL pipe + adapter assembly to the support box with screws through the adapter ring.

Then I got to thinking ... ... how does this work?

The adapter slips snuggly into the inside of the end of the DVL pipe. If you look down through the adapter, the airway openings between the double walls of the DVL pipe are exposed. At the other end of my stove pipe, at the stove vent, I have a DVL appliance adapter that allows room air to go up into the double walls of the DVL pipe. So it looks like room air would go up between the double walls until it reaches the adapter, then gets dumped/mixed into the central 6 inch exhaust/smoke/soot air stream to continue up the chimney exhaust.

This leads to three questions:

1) Is this supposed to happen?
2) Can cresote/soot drip/fall down the chimney, past the adapter, and go down the air channels between the DVL double walls?
3) Does the support box (with its integral chimney pipe adapter in the bottom, allow "fresh" air to enter the double walls at the bottom of the chimney pipe(s), or are the air channels between the chimney pipe(s) essentially sealed?

I am "Dangerous"

There is an airgap between the walls of the DVL, but it's not allowing air into the flue. Not sure what you are seeing that makes you think this is happening. If you used the proper components, it can't happen. Did you push the pipe up tight against the box before screwing the slip together? If not, the pipe will pull the adaptor down a little allowing a gap. But the cooling air still can't make its way into the flue.

 

[greythorn3]

is this the new design?

 

[webby3650]

Yes, that's the one !