diff --git a/src/enrichment.h b/src/enrichment.h
index 243eb6703d..b6767afb4c 100644
--- a/src/enrichment.h
+++ b/src/enrichment.h
@@ -314,7 +314,9 @@ class Enrichment : public cyclus::Facility {
 
   #pragma cyclus var {							\
     "default": 1e299, "tooltip": "max inventory of feed material (kg)", \
-    "uilabel": "Maximum Feed Inventory",                                \
+    "uilabel": "Maximum Feed Inventory", \
+    "uitype": "range", \
+    "range": [0.0, 1e299], \
     "doc": "maximum total inventory of natural uranium in "		\
            "the enrichment facility (kg)"     \
   }
@@ -323,7 +325,7 @@ class Enrichment : public cyclus::Facility {
   #pragma cyclus var { \
     "default": 1.0,						\
     "tooltip": "maximum allowed enrichment fraction",		\
-    "doc": "maximum allowed weight fraction of U235 in product",\
+    "doc": "maximum allowed weight fraction of U235 in product", \
     "uilabel": "Maximum Allowed Enrichment", \
     "schema": '<optional>'				     	   \
         '          <element name="max_enrich">'			   \
@@ -350,6 +352,8 @@ class Enrichment : public cyclus::Facility {
     "default": 1e299,						       \
     "tooltip": "SWU capacity (kgSWU/month)",			       \
     "uilabel": "SWU Capacity",                                         \
+    "uitype": "range",                                                  \
+    "range": [0.0, 1e299],                                               \
     "doc": "separative work unit (SWU) capacity of enrichment "		\
            "facility (kgSWU/timestep) "                                     \
   }
diff --git a/src/fuel_fab.h b/src/fuel_fab.h
index 9fe257f5ce..5f8cdc3ced 100644
--- a/src/fuel_fab.h
+++ b/src/fuel_fab.h
@@ -232,6 +232,9 @@ class FuelFab : public cyclus::Facility {
     "doc": "Maximum number of kg of fuel material that can be supplied per time step.", \
     "uilabel": "Maximum Throughput", \
     "units": "kg", \
+    "default": 1e299, \
+    "uitype": "range", \
+    "range": [0.0, 1e299], \
   }
   double throughput;
 
diff --git a/src/mixer.h b/src/mixer.h
index 3ab2d35d61..2180b034af 100644
--- a/src/mixer.h
+++ b/src/mixer.h
@@ -84,6 +84,8 @@ class Mixer : public cyclus::Facility {
             " available.", \
     "uilabel": "Maximum Leftover Inventory", \
     "default": 1e299, \
+    "uitype": "range", \
+    "range": [0.0, 1e299], \
     "units": "kg", \
   }
   double out_buf_size;
@@ -95,6 +97,8 @@ class Mixer : public cyclus::Facility {
     "default": 1e299, \
     "doc": "Maximum number of kg of fuel material that can be mixed per time step.", \
     "uilabel": "Maximum Throughput", \
+    "uitype": "range", \
+    "range": [0.0, 1e299], \
     "units": "kg", \
   }
   double throughput;
diff --git a/src/separations.h b/src/separations.h
index aa0184c646..b226dc9c82 100644
--- a/src/separations.h
+++ b/src/separations.h
@@ -145,6 +145,9 @@ class Separations : public cyclus::Facility {
     "doc" : "Maximum quantity of feed material that can be processed per time "\
             "step.", \
     "uilabel": "Maximum Separations Throughput", \
+    "default": 1e299, \
+    "uitype": "range", \
+    "range": [0.0, 1e299], \
     "units": "kg/(time step)", \
   }
   double throughput;
@@ -166,6 +169,8 @@ class Separations : public cyclus::Facility {
             "available.", \
     "uilabel": "Maximum Leftover Inventory", \
     "default": 1e299, \
+    "uitype": "range", \
+    "range": [0.0, 1e299], \
     "units": "kg", \
   }
   double leftoverbuf_size;