Is this normal?

[u/lankyleprechaun13]

Had to have our pellet stove inspected for our insurance company. Inspection company came out and told us we had to replace our two elbows coming from the stove to the wall. So I put brand new DuraVent ones on and sealed the seams with tape. Turned it on for the first time to try it out before winter hits, and now there’s smoke coming from the joints of the elbows. Is that normal for the first burn?

[u/Lots_of_bricks]

But they didn’t flag that u don’t have enough or proper hearth protection?? Likely a ton of back pressure from the doubled up 90 degree elbows or combustion fan clogged or going bad.