Update external/lab-equipment/hoods/hoods.md

external/lab-equipment/hoods/hoods.md

@@ -43,8 +43,8 @@ not protecting the users against chemicals risks.
 
 At LCSB, we have some BSC with a thimble connection allowing to work in
 a sterile environment with volatile chemical compounds. Thanks to the
-thimble connection, the 30% of the air that are blown in the laboratory
-in a normal BSC configuration are blown drawn in the exhaust air of the
+thimble connection, the 30% of the air that is blown in the laboratory
+in a normal BSC configuration is drawn in the exhaust air of the
 building. This kind of hood is providing a sterile environment for the
 sample protection and a protection of the user against biohazard and
 volatile chemicals.