Have you had dusty wood pellets in your store?
Were you aware of segregation? Did your installer talk to you about how the fines would concentrate towards the bottom of the store and the end of the load, and how you would need to clear your store regularly to avoid a build-up of fines?
If you had dusty wood pellets, did you take a sample and get it analysed? How did you take the sample? Was it representative of the whole load? What were the results of the analysis?