Add a "Smokin-It" Cold Smoke Generator to Timberline 850

So I’ve done this mod down to the finest details of constructing it, and it seems I’m still experiencing backflow from the Traeger when its fan is running. I keep seeing smoke coming from the Bella, and it swirls around the shelf area when the grill’s fan kicks on.

One caveat is that I didn’t drill the hole for the Venturi tube that’s inserted into the grill a perfect fit. I’m not the handiest of people, and the hole I drilled is slightly larger than the circumference of the tube. This happened because things weren’t perfectly aligned when I was measuring mounting the Bella. I had to adjust the drill hole so it would sit flush. It sits flush to the grill from what I can tell now, but I suspect this is the problem. What solutions would you recommend to close the hole a bit from the inside or outside? I thought a grommet might be the solution, but it’s difficult to find one that I can fit into the hole and still allow the smoke tube through.
 
What solutions would you recommend to close the hole a bit from the inside or outside?

You might try high temp tape, otherwise buy a couple of larger washers that will fit the circumference of your inlet pipe and place them on both sides. As for your backflow, is it possible the stock air pump isn't strong enough? Were you running the air pump on its highest setting? I've found that with my Smoke Daddy Magnum PIG, I have to run the air pump at 55% or higher to fight my 780 Pro's convection fan, otherwise smoke pours out of my Smoke Daddy lids.
 
So I’ve done this mod down to the finest details of constructing it, and it seems I’m still experiencing backflow from the Traeger when its fan is running. I keep seeing smoke coming from the Bella, and it swirls around the shelf area when the grill’s fan kicks on.

One caveat is that I didn’t drill the hole for the Venturi tube that’s inserted into the grill a perfect fit. I’m not the handiest of people, and the hole I drilled is slightly larger than the circumference of the tube. This happened because things weren’t perfectly aligned when I was measuring mounting the Bella. I had to adjust the drill hole so it would sit flush. It sits flush to the grill from what I can tell now, but I suspect this is the problem. What solutions would you recommend to close the hole a bit from the inside or outside? I thought a grommet might be the solution, but it’s difficult to find one that I can fit into the hole and still allow the smoke tube through.
I made a gasket out of thin ceramic wool material to seal the Smoke tube. I place it between the Bella and the grill. I also wrapped it in foil to protect it.

Got it thru Amazon.
 

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This is also why we did the extension tubes inside, extending till you get next to the firepot, that seams to quiet the back pressure a bit.
But you do need to seal that oversized hole.
 
You might try high temp tape, otherwise buy a couple of larger washers that will fit the circumference of your inlet pipe and place them on both sides. As for your backflow, is it possible the stock air pump isn't strong enough? Were you running the air pump on its highest setting? I've found that with my Smoke Daddy Magnum PIG, I have to run the air pump at 55% or higher to fight my 780 Pro's convection fan, otherwise smoke pours out of my Smoke Daddy lids.
The high temp tape sounds promising. I’ve tried installing washers around the smoke tube using high temp glue. Problem is when I need to remove the tube for cleaning. Because of of the tight fitment of my install, the torque of twisting the tube out of the notch in the Bella strips the washers from their glued positions. I’ve tried using a more powerful air pump too. I still get back flow of smoke when the Traeger fan is on. And I’ve installed the insulation on the Bella facing the grill, and I have a longer extension tube that extends past the fire pot. I’m thinking it has to be that size of hole.
 
and I have a longer extension tube that extends past the fire pot.

The reason I stop my tube at the firepot is because that is where you have the most upwards draft from heat and the smoke can actually be sucked up into that, anywhere else in the grill seems to be high pressure from the fan.
Back draft will always be there but it seems less at the firepot
 
The reason I stop my tube at the firepot is because that is where you have the most upwards draft from heat and the smoke can actually be sucked up into that, anywhere else in the grill seems to be high pressure from the fan.
Back draft will always be there but it seems less at the firepot

That's good logic. I might try that as well (even though my mod is the Smoke Daddy Magnum PIG). Right now I'm running with zero extension pipe because I got annoyed at cleaning the creosote from it, and even with no extension and being located on my chimney-side (Traeger Pro 780), it seems to fill the entire grill with smoke.
 

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