DVL parts help ?

I'll have a 6" DVL elbow down to stove.
From the center of the horizontal run to the top of the stove outlet is 43"(+,-).
The 90 says it's 9" from the horizontal center to bottom edge. The stove adapter says it takes up 4".
This leaves me with 30"(+,-) vertical to fill.

I could get an adjustable 29"-48" or I could get an adjustable 4"-11" plus a fixed 24".

I don't know what the actual installed height of these will be and I haven't accounted for an "upslope" of the horizontal run.
If the 29" was barely short enough I wonder if it will make assembly/disassembly tough ?
Would you order the 29"-48" or the 4"-11" plus a fixed 24" ? Or...would you order all 3 and return the unused ?

BeGreen said:

I'd prolly get the 12-19" adjustable (#8687) and a fixed length 12" piece of DVL.

Click to expand...

That does sound even better, but the place I'm set to order from doesn't list a 12"-19".
They only list a 3"-5" and 4"-11"

BeGreen said:

Is this Simpson DVL pipe? I haven't found this listed in the Simpson catalog, but maybe I missed it. Where are you ordering from?

Click to expand...

Thanks for your quick responses.
http://www.fireplacedeals.com/Vent-Pipe-Double-Wall-6"-Double-Wall/c187_202_203/index.html?page=2

LOL !
The store seems to have the impression that it collapses.
I can't tell who's right ? Your description stands up to logic better, imo.

The .pdf catalog I downloaded for DVL says "...6" pipe adds 2"-5" of length, 12" pipe adds 2"-10" of length, when used with rigid sections of pipe..."
Page 3 here: http://www.duravent.com/pdf/catalogs/dvl.pdf
The store says 4"-11". The .pdf says 2"-10". How the heck do you go from 2" to 10" ? LOL !
Your description works better for me but I'm still unsure what to order. lol
Assuming the store and this .pdf are correct, what would you order ? The 29"-46" or the #8687+24" rigid ?
I would think less joints is preferable but I'm unsure if the 29", when installed, will be short enough to allow some upward angle to the horizontal.
Also, which will be easier to disassemble ?
Sorry this has turned out to be a confusing p.i.t.a.. I'd just like to have my plan set before I start punching holes and ordering parts.
Thanks again for your attention.

Will do. I'll also ask if I really need to cut 12"x12" out of the (non-combustible) cinder blocks for the thimble.
Thanks for your time and patience. You've obviously dealt with 100s or 1000s of newbies here.

I've found these other (conflicting?) descriptions:

"6" DVL 12" adjustable slips over solid sections of the DVL double wall pipe providing a 3" to 10" extension."

"The shorter length allows adjustment from 3" - 5". The longer length gives you 4" - 11" of adjustment. Both pieces must have a minimum of 1" overlap with all connecting pipe."

I guess this is the route I'll take but I'll probably always wonder if the 29"-48" would have been a "cleaner" install. I just don't know how to determine which is better
without putting my hands on them.

I'm still trying to imagine how a pipe section can adjust from 2" to 10". Do you cut the bottom or does it slide over the rigid section ?