AMNTS arrived and un-boxed.
Very simple devices, Very well made and good clear instructions. The recipe booklet has some great ideas in it too.
I decided to do a dry run with them to see how they performed. They were used without any other heat source as if I was cold smoking
Filled with dry oak pellets and allowed to burn for a few minutes before the flame was blown out and the tubes placed in the smokers
The 6" in place in one of the Webers (before being lit)
After being lit
The 12" in place i the offset smoker
After less than a minute the smoke in the smoking chamber
As smoke generators they worked very well. I can see them as being especially effective in a gas BBQ when roasting.
I timed the burn of each - and this was where I was a little disappointed and need to get Todd's advice. Both only produced about 3 hours smoke - although the smoke they did produce was very consistent. This is very short in comparison to the 14 + hours that I get with my AMNPS type smoke generator in the offset. They were both in very different situations though - the 6 inch was in the bottom of the Weber that would have had constant, but relatively slow, air flow around it. The 12" was in in the fire box of the offset that does have a good air draw through it. Maybe this air draw acted like smoking a cigarette causing it to burn faster.
Conclusion so far - very nice devices that produce good smoke. I just need to work out how to increase the burn time of the 12".