Do stoves "warm up" ? I had to open my air damper to 1/2 instead of 1/3 as it burned lazy when the air is still. I noticed that even tho I put my exhaust at a lower speed some pellets dance and pop out into the ash pan. Once the pellets drop in and get burning the jumping around stops. Also sparks fly when the pellets drop in. I assume the sparks are a normal issue, is that correct ? I also am wondering is it ok to just to burn box store pellets ? I got a bag of their cheapest pellets(energex) at the stove store that are cheaper (ten cents) that Lowe's pellets when you buy ten bags. All the different bags produce ash and clumps in the pot along with dirty the glass after a days run. Propane fill was $1.75/gal. so I didn't want to spend a lot in pellets. Is it ok when stores have there pellet skids stored outdoors ? Thanks. GBY