Exhaust Pipe
Exhaust Pipes are blocks used to transport polluting fluids such as 
carbon dioxide between polluting machines.
There are five variants of the exhaust pipe, that only vary in size. Another variant, the paintable coated exhaust pipe, is available for when you wish to transport polluting fluids through a wall without leaving a visible gap.
It can visually integrate the exhaust pipes into walls, and can be painted by using any solid block on it, which will change its texture to match the held block.
Usage
It is only used for the smokestack. It can be placed like a normal block and connected to ports. The paintable solid block can be connected to the normal exhaust pipes, and functions the same.
To use it, connect the polluting machine to the smokestack using exhaust pipes.
Crafting
The exhaust pipe can be obtained early game, only needing iron and an insulator. As mentioned before, the crafting recipe is identical between all variants.
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