Merge pull request #211 from amunizp/patch-2

Update safety.md

docs/plastic/safety.md

@@ -125,7 +125,7 @@ When working with plastic, you should have an activated carbon filter gas mask,
 
 <img style="margin-left: 0;" src="../assets/plastic/ventilation_three.jpg" width="600"/>
 
-LEV stands for Local Exhaust Ventilation, which is an industry standard to ventilate toxic air efficiently. This system is made of three parts: a hood for allowing contaminant clouds to enter the LEV, ducting which transfers air and the contaminant from the hood to the discharge point, and attached to a centrifugal fan with 780-1000 cubic meter (of what?) per hour.
+LEV stands for Local Exhaust Ventilation, which is an industry standard to ventilate toxic air efficiently. This system is made of three parts: a hood for allowing contaminant clouds to enter the LEV, ducting which transfers air and the contaminant from the hood to the discharge point, and attached to a centrifugal fan with 780-1000 cubic meters per hour flow rate.
 
 ## Activated Carbon
 
@@ -159,4 +159,4 @@ If you take the proper safety precautions of a proper gas mask and extraction fi
 2. [Removal of VOCs from polluted air](http://beta.chem.uw.edu.pl/people/AMyslinski/nowy/zarzadzanie_01/literature_HWW/02.pdf)       
 3. [Evaluation of GAC filters to remove VOCs](https://www.isiaq.org/docs/papers/940.pdf)
 
-<b>Want to share feedback, chat about safety or learn more from the community? Head to the [#plastic](https://discordapp.com/invite/n5d8Vrr) channel on Discord. Here we talk about plastic, safety, fumes and material properties.</b>
+<b>Want to share feedback, chat about safety or learn more from the community? Head to the [#plastic](https://discordapp.com/invite/n5d8Vrr) channel on Discord. Here we talk about plastic, safety, fumes and material properties.</b>