Device working volumes are configurable from setup

code/setup.dm

@@ -836,10 +836,16 @@ var/list/RESTRICTED_CAMERA_NETWORKS = list( //Those networks can only be accesse
 #define MAX_FILTER_FLOWRATE	200		//L/s
 
 //These balance how easy or hard it is to create huge pressure gradients with pumps and filters. Lower values means it takes longer to create large pressures differences. 
-//If you want to limit the ability of players to create very high pressures then it makes more sense to adjust these instead of artificially limiting the pump settings. 
 //Has no effect on pumping gasses from high pressure to low, only from low to high. Must be between 0 and 1.
 #define ATMOS_PUMP_EFFICIENCY	0.6
 #define ATMOS_FILTER_EFFICIENCY	0.45
 
-#define MINUMUM_MOLES_TO_PUMP	0.01	//will not bother pumping or filtering if the gas source as fewer than this amount of moles, to help with performance.
+//will not bother pumping or filtering if the gas source as fewer than this amount of moles, to help with performance.
+#define MINUMUM_MOLES_TO_PUMP	0.01
 #define MINUMUM_MOLES_TO_FILTER	0.1
+
+//The flow rate/effectiveness of various atmos devices is limited by their internal volume, so these will control maximum flow rates in L/s
+#define ATMOS_DEFAULT_VOLUME_PUMP	200	//L
+#define ATMOS_DEFAULT_VOLUME_FILTER	200	//L
+#define ATMOS_DEFAULT_VOLUME_MIXER	200	//L
+#define ATMOS_DEFAULT_VOLUME_PIPE	70	//L