Ceiling Box and General Install Questions

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adamflyer

New Member
Nov 28, 2023
2
Central Arizona
Hi All,

I just purchased a Green Mountain 60 wood stove to put in my great room and have some first time installer confusion. Attached is a drawing that shows the setup I'm planning on. My questions are as follows:

1. I'm confused about the connection between the DVL and the ceiling support box. The drawing I found in the documentation shows it has some sort of an adapter protruding from the bottom but all the pictures I see of the box for sale I don't. Best I can tell I need the "DLV Adapter (6DVL-ADT) or do I need something else?

2. I assume my transition between DVL pipe and Class A Duratech pipe is at the bottom of the ceiling box via that "DLV Adapter". So then I just need to make sure this junction is at least 8" away from my ceiling per the 8" ceiling clearance spec for the DLV (since the pipe is coming up at an angle vs vertical) or something else. Also does it look like there is enough room in my drawing for the connection to keep this clearance?

3. As far as I can tell by reading the documentation, by using the ceiling support box there is no other structural support for the stove or chimney pipe other than the "DLV Adapter" junction between DVL and Class A pipe at the bottom of the box. Do I really not need any more support for the chimney pipe other than this for less than 5' above the roofline? I guess the roof flashing above and the stove connection below will stabilize it but it seems like it would need more.

4. If there is a more foolproof way of doing the flashing than tucking the uphill side under the ridge cap please say so. Roof penetrations make me nervous.

Of course I'm open to any other critique to my plan. I like to do things correct the first time. Thanks in advance.
-Adam

Stove_Design_20231128.jpg
 
6DVL-ADT is the right ceiling support to DVL adapter. Each section of the DVL stove pipe gets screwed with 3 screws, effectively making it one unit. The one thing to watch is the Damper section. Unfortunately DuraVent only sells this in the adapter instead of offering the option for it to be in a 6" section of regular DVL. The problem is that for many stoves the adapter is not only unnecessary, it's too small at the flue collar leading to a leaky seal. On many stoves, the DVL pipe connects nicely without any adapter to the flue collar on the stove. I ran into this recently and had to remove the damper from the adapter and then put it into a 6" section of DVL.

The chimney is supported by the cathedral ceiling support box. There is no need for additional chimney support if the chimney is less than 5 ft from the roof exit. If greater, then a roof brace must be installed at the 5' level. In this case it doesn't look like that will be necessary.
 
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6DVL-ADT is the right ceiling support to DVL adapter. Each section of the DVL stove pipe gets screwed with 3 screws, effectively making it one unit. The one thing to watch is the Damper section. Unfortunately DuraVent only sells this in the adapter instead of offering the option for it to be in a 6" section of regular DVL. The problem is that for many stoves the adapter is not only unnecessary, it's too small at the flue collar leading to a leaky seal. On many stoves, the DVL pipe connects nicely without any adapter to the flue collar on the stove. I ran into this recently and had to remove the damper from the adapter and then put it into a 6" section of DVL.

The chimney is supported by the cathedral ceiling support box. There is no need for additional chimney support if the chimney is less than 5 ft from the roof exit. If greater, then a roof brace must be installed at the 5' level. In this case it doesn't look like that will be necessary.
Thank you for the quick reply. I ordered the parts. Can't wait for some good wood heat.
 
I wrote today to DuraVent about getting the damper put in a regular section of 6" DVL from the factory. This should be an easy one for them. Hope they do it.