Ok, so I have some useful data for people who want to math things out. I found a power point talking all about dust explosions. You can download it
here. (doesn't seem to be copyrighted or anything, so I'm assuming this is ok)
Referencing a document published by the National Fire Protection Association, you can get a rough estimate of the diameter of a dust explosion (D) by using the volume of the space the dust is contained in (V) with the following formula:
D= 10(V^1/3)
For the sake of simplicity, let's assume that the Macerator releases its contents in a 1m
3, which would make the rough maximum diameter of the fireball 10 meters, or a radius of 5 meters. That's the fireball itself, but the damage to people is still going to extend further due to radiant heat, which can cause severe burns.
NOTE - The wiki says explosive seals have a "max range" of 20m, but this seems a bit large to me if it's the radius. Could that be diameter? I would hope so, because a 20m max radius for an explosive tag's effect would seem larger than some of the fire jutsu being thrown around in canon. I also don't recall any explosive tags having this large of a radius from canon examples.
@OliWhail,
@eaglejarl,
@Velorien - could one of you please clarify on this?
HOWEVER, the Macerator 2.0 releases its contents at a speed of 20 m/s. This means that as the material is combusting it can also be moving at high velocity, which should increase the effective area of the fireball. The videos I've seen that aren't in slow motion have the fireballs from sawdust explosions lasting from anywhere from roughly one to two seconds, which means that since momentum is conserved the combusting material is going to be moving outward during that time, unlike dust explosions where the dust is just floating around at very low speed.
For the sake of simplicity, maybe we can just say that the fireball from a fully loaded burning log Macerator 2.0 has a radius of ~25 meters? We don't really have a way to test this anyways, so unless
@Radvic wants to figure out the math a guesstimate is probably fine.
If we say ~25 meters in radius, that's a big fireball that'd probably kill or severely burn (3rd degree burns over much of their body) anyone caught inside of it and catch fire to other flammable materials in the area. We'd need an idea of how hot this is burning and for someone to calculate the range at which the radiant heat would be dangerous as well.