Standard for Azwood Wood Pellets
||<6 x dia mm
||Pinus Radiata & Douglas Fir
No treated Material Wood.
Top quality pellets vary colours and lengths
Wood Pellet Colour
When looking at different fuels, you may notice there are many different colours of pellets. Pellets vary in colour depending of the in feed material at the time. Colour has very little to do with quality or density, it is just a visual.
Wood Pellet Length
From season to season or brand to brand, its very likely that the pellets you buy could be shorter or longer in length on average. This is very normal. There are several variables that determine the length of a pellet during manufacturing and any one of them could be different from brand to brand or season to season.
How does this effect burn? Longer pellets will feed less fuel into the fire with the rotations of the auger than shorter pellets. If everything else in the pellet fire stays the same, and the only difference in the fuel is pellet length, the shorter pellets will provide more fuel to the fire than the longer pellets.
You may need to reduce the feed rate or increase air flow through the fire to maintain the correct fuel to air ratio. If you don't you could have incomplete combustion, leading to more ash, black glass, a lazy fire or lower combustion and heat.
Wood Pellet Density
If you have two brands of pellets and stack 10 bags of one brand next to 10 bags of the other brand you may notice one stack is higher? The taller stack is the less dense pellet. Being less dense isn't bad, but it does change the fuel-to-air ratio in the pellet fire.