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Thanks - I checked the grates and even cleaned the holes just in case. I did remove some carbon pellets and that seems to help significantly. Do you happen to know if packing them too tightly will cause a restriction? (I ordered the same as stated in your BOM). Basically, how do you know you have too many in there? :)

I am curious how well these would do as replacements for the carbon pellets - thoughts? https://www.amazon.com/Carbon-Filter-Activated-Weller-Absorber/dp/B009AE8DWO/ref=sr_1_5?ie=UTF8&qid=1517011950&sr=8-5&keywords=activated+carbon+filter