diff --git a/Buildings/Fluid/AirFilters/BaseClasses/FiltrationEfficiency.mo b/Buildings/Fluid/AirFilters/BaseClasses/FiltrationEfficiency.mo
index 17fc18b98ee..372d1b025f3 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/FiltrationEfficiency.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/FiltrationEfficiency.mo
@@ -10,27 +10,27 @@ model FiltrationEfficiency
     final unit="kg")
     "Mass of the contaminant captured by the filter"
     annotation (Placement(
-        transformation(
-        extent={{20,-20},{-20,20}},
-        rotation=180,
-        origin={-120,0}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=0,
-        origin={-120,0})));
+    transformation(
+    extent={{20,-20},{-20,20}},
+    rotation=180,
+    origin={-120,0}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=0,
+    origin={-120,0})));
   Buildings.Controls.OBC.CDL.Interfaces.RealOutput y(
     final unit="1",
     final min=0,
     final max=1)
     "Filtration efficiency"
     annotation (Placement(transformation(extent={{100,-80},{140,-40}}),
-        iconTransformation(extent={{100,-80},{140,-40}})));
+    iconTransformation(extent={{100,-80},{140,-40}})));
   Buildings.Controls.OBC.CDL.Interfaces.RealOutput rat(
     final unit="1",
     final min=0,
     final max=1)
     "Relative mass of the contaminant captured by the filter"
-   annotation (Placement(transformation(extent={{100,40},{140,80}}),
-       iconTransformation(extent={{100,40},{140,80}})));
+    annotation (Placement(transformation(extent={{100,40},{140,80}}),
+    iconTransformation(extent={{100,40},{140,80}})));
 
 equation
   rat = Buildings.Utilities.Math.Functions.smoothMin(x1=1, x2= mCon/mCon_nominal, deltaX=0.1);
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/FlowCoefficientCorrection.mo b/Buildings/Fluid/AirFilters/BaseClasses/FlowCoefficientCorrection.mo
index 3988b3f5d56..22c8b6122a8 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/FlowCoefficientCorrection.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/FlowCoefficientCorrection.mo
@@ -1,28 +1,31 @@
 within Buildings.Fluid.AirFilters.BaseClasses;
 model FlowCoefficientCorrection
   "Component that calculates the flow coefficient correction factor"
-  parameter Real b(
-    final min = 1 + 1E-3)
+  parameter Real b
     "Resistance coefficient";
   Buildings.Controls.OBC.CDL.Interfaces.RealInput rat(
     final unit="1",
     final min=0,
     final max=1)
     "Relative mass of the contaminant captured by the filter"
-   annotation (Placement(
-        transformation(
-        extent={{20,-20},{-20,20}},
-        rotation=180,
-        origin={-120,0}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=0,
-        origin={-120,0})));
+    annotation (Placement(
+    transformation(
+    extent={{20,-20},{-20,20}},
+    rotation=180,
+    origin={-120,0}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=0,
+    origin={-120,0})));
   Buildings.Controls.OBC.CDL.Interfaces.RealOutput y(
     final unit="1",
     final min=1)
     "Flow coefficient correction"
     annotation (Placement(transformation(extent={{100,-20},{140,20}}),
-        iconTransformation(extent={{100,-20},{140,20}})));
+    iconTransformation(extent={{100,-20},{140,20}})));
+initial equation
+    assert(b > 1,
+      "In " + getInstanceName() + ":Resistance coefficient should be larger than 1",
+      level=AssertionLevel.error);
 equation
   y = b^rat;
   annotation (Dialog(group="Pressure"),
@@ -43,7 +46,7 @@ equation
 This model calculates the flow coefficient of the filter by
 </p>
 <p align=\"center\" style=\"font-style:italic;\">
-  kCor = b<sup>rat</sup>,
+ kCor = b<sup>rat</sup>,
 </p>
 <p>
 where <code>b</code> is the resistance coefficient and it has to be greater than 1,
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/MassAccumulation.mo b/Buildings/Fluid/AirFilters/BaseClasses/MassAccumulation.mo
index adb37786978..e1a0360c67d 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/MassAccumulation.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/MassAccumulation.mo
@@ -9,28 +9,28 @@ model MassAccumulation
   Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uRep
     "Replacing the filter when trigger becomes true"
     annotation (Placement(
-        transformation(
-        extent={{20,-20},{-20,20}},
-        rotation=180,
-        origin={-120,-60}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=0,
-        origin={-120,-62})));
+    transformation(
+    extent={{20,-20},{-20,20}},
+    rotation=180,
+    origin={-120,-60}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=0,
+    origin={-120,-62})));
   Buildings.Controls.OBC.CDL.Interfaces.RealInput mCon_flow(
     final unit = "kg/s")
     "Contaminant mass flow rate"
     annotation (Placement(transformation(
-        extent={{20,-20},{-20,20}},
-        rotation=180,
-        origin={-120,60}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=0,
-        origin={-120,60})));
+    extent={{20,-20},{-20,20}},
+    rotation=180,
+    origin={-120,60}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=0,
+    origin={-120,60})));
   Buildings.Controls.OBC.CDL.Interfaces.RealOutput mCon(
     final unit = "kg")
     "Mass of the contaminant captured by the filter"
     annotation (Placement(transformation(extent={{100,-20},{140,20}}),
-        iconTransformation(extent={{100,-20},{140,20}})));
+    iconTransformation(extent={{100,-20},{140,20}})));
   Buildings.Controls.OBC.CDL.Reals.IntegratorWithReset intWitRes
     "Calculate the mass of contaminant"
     annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
@@ -50,36 +50,37 @@ model MassAccumulation
     "Error message when the filter is full, i.e., the mass captured by the filter is larger than the nominal value"
     annotation (Placement(transformation(extent={{72,-48},{92,-28}})));
 equation
-  connect(intWitRes.u, mCon_flow) annotation (Line(points={{-12,0},{-40,0},{-40,
-          60},{-120,60}}, color={0,0,127}));
+  connect(intWitRes.u, mCon_flow)
+    annotation (Line(points={{-12,0},{-40,0},{-40,60},
+    {-120,60}}, color={0,0,127}));
   connect(intWitRes.y, mCon)
     annotation (Line(points={{12,0},{120,0}}, color={0,0,127}));
   connect(con.y, intWitRes.y_reset_in)
     annotation (Line(points={{-58,-20},{-20,-20},
-          {-20,-8},{-12,-8}},color={0,0,127}));
+    {-20,-8},{-12,-8}},color={0,0,127}));
   connect(intWitRes.trigger, uRep)
     annotation (Line(points={{0,-12},{0,-60},{-120,-60}}, color={255,0,255}));
   connect(assMes.u, greater.y)
     annotation (Line(points={{70,-38},{61,-38}}, color={255,0,255}));
   connect(greater.u2, intWitRes.y)
-    annotation (Line(points={{38,-46},{20,-46},{20,
-          0},{12,0}}, color={0,0,127}));
+    annotation (Line(points={{38,-46},{20,-46},{20,0},
+    {12,0}}, color={0,0,127}));
   connect(con1.y, greater.u1)
     annotation (Line(points={{22,50},{30,50},{30,-38},
-          {38,-38}}, color={0,0,127}));
+    {38,-38}}, color={0,0,127}));
   annotation (Icon(coordinateSystem(preserveAspectRatio=false), graphics={
-          Rectangle(
-          extent={{-100,100},{100,-100}},
-          lineColor={28,108,200},
-          fillColor={255,255,255},
-          fillPattern=FillPattern.Solid),
-        Text(
-          extent={{-100,140},{100,100}},
-          textColor={0,0,255},
-          textString="%name")}),
-          Diagram(coordinateSystem(
-          preserveAspectRatio=false)),
-          defaultComponentName="masAcc",
+   Rectangle(
+   extent={{-100,100},{100,-100}},
+   lineColor={28,108,200},
+   fillColor={255,255,255},
+   fillPattern=FillPattern.Solid),
+   Text(
+   extent={{-100,140},{100,100}},
+   textColor={0,0,255},
+   textString="%name")}),
+   Diagram(coordinateSystem(
+   preserveAspectRatio=false)),
+   defaultComponentName="masAcc",
     Documentation(info="<html>
 <p>
 This model mimics the process for a filter to capture the contaminants.
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/MassTransfer.mo b/Buildings/Fluid/AirFilters/BaseClasses/MassTransfer.mo
index 6447ab77b4a..f0d0f826efe 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/MassTransfer.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/MassTransfer.mo
@@ -5,24 +5,24 @@ model MassTransfer
   Buildings.Controls.OBC.CDL.Interfaces.RealInput C_inflow[Medium.nC]
     "Input trace substance rate"
     annotation (Placement(transformation(
-        extent={{-20,-20},{20,20}},
-        rotation=270,
-        origin={0,120}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=270,
-        origin={0,120})));
+    extent={{-20,-20},{20,20}},
+    rotation=270,
+    origin={0,120}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=270,
+    origin={0,120})));
   Buildings.Controls.OBC.CDL.Interfaces.RealInput eps(
     final unit = "1",
     final min = 0,
     final max= 1)
     "Mass transfer coefficient"
     annotation (Placement(transformation(
-        extent={{20,-20},{-20,20}},
-        rotation=180,
-        origin={-120,60}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=0,
-        origin={-120,60})));
+    extent={{20,-20},{-20,20}},
+    rotation=180,
+    origin={-120,60}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=0,
+    origin={-120,60})));
 equation
   if allowFlowReversal then
     port_b.C_outflow =inStream(port_a.C_outflow) - eps*C_inflow;
@@ -48,12 +48,12 @@ equation
   end if;
 
   annotation (Icon(coordinateSystem(preserveAspectRatio=false), graphics={
-          Rectangle(
-          extent={{-100,100},{100,-100}},
-          fillColor={255,255,255},
-          fillPattern=FillPattern.Solid,
-          pattern=LinePattern.None)}),                           Diagram(
-        coordinateSystem(preserveAspectRatio=false)),
+    Rectangle(
+    extent={{-100,100},{100,-100}},
+    fillColor={255,255,255},
+    fillPattern=FillPattern.Solid,
+    pattern=LinePattern.None)}), Diagram(
+    coordinateSystem(preserveAspectRatio=false)),
     defaultComponentName="masTra",
     Documentation(info="<html>
 <p>
@@ -61,7 +61,7 @@ This model sets the trace substance
 of the medium that leaves <code>port_b</code> by
 </p>
 <pre>
-  port_b.C_outflow = inStream(port_a.C_outflow) - eps * C_inflow;
+port_b.C_outflow = inStream(port_a.C_outflow) - eps * C_inflow;
 </pre>
 <p>
 where <code>eps</code> is an input mass transfer efficiency and
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/PressureDropWithVaryingFlowCoefficient.mo b/Buildings/Fluid/AirFilters/BaseClasses/PressureDropWithVaryingFlowCoefficient.mo
index 50a5be02774..a3a98dfe80a 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/PressureDropWithVaryingFlowCoefficient.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/PressureDropWithVaryingFlowCoefficient.mo
@@ -13,16 +13,16 @@ model PressureDropWithVaryingFlowCoefficient
     final min = 1)
     "Flow coefficient"
     annotation (Placement(transformation(
-        extent={{-20,-20},{20,20}},
-        rotation=270,
-        origin={0,120}), iconTransformation(
-        extent={{-20,-20},{20,20}},
-        rotation=270,
-        origin={0,120})));
+    extent={{-20,-20},{20,20}},
+    rotation=270,
+    origin={0,120}), iconTransformation(
+    extent={{-20,-20},{20,20}},
+    rotation=270,
+    origin={0,120})));
 protected
   final parameter Boolean computeFlowResistance=(dp_nominal_pos > Modelica.Constants.eps)
     "Flag to enable/disable computation of flow resistance"
-   annotation(Evaluate=true);
+    annotation(Evaluate=true);
 
 initial equation
   if computeFlowResistance then
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/Validation/FiltrationEfficiency.mo b/Buildings/Fluid/AirFilters/BaseClasses/Validation/FiltrationEfficiency.mo
index 17e89b1c2be..5ba92d99700 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/Validation/FiltrationEfficiency.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/Validation/FiltrationEfficiency.mo
@@ -15,7 +15,7 @@ model FiltrationEfficiency
     annotation (Placement(transformation(extent={{-60,-10},{-40,10}})));
 equation
   connect(mCon.y, eps.mCon)
-    annotation (Line(points={{-39,0},{-12,0}}, color={0,0,127}));
+  annotation (Line(points={{-39,0},{-12,0}}, color={0,0,127}));
   annotation (experiment(Tolerance=1e-6, StopTime=1.0),
 __Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/AirFilters/BaseClasses/Validation/FiltrationEfficiency.mos"
         "Simulate and plot"),
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassAccumulation.mo b/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassAccumulation.mo
index d4f2494974a..1e8abc3d02d 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassAccumulation.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassAccumulation.mo
@@ -19,10 +19,12 @@ model MassAccumulation
     "Filter replacement signal"
     annotation (Placement(transformation(extent={{-60,-30},{-40,-10}})));
 equation
-  connect(RepSig.y, masAcc.uRep) annotation (Line(points={{-38,-20},{-20,-20},{
-          -20,-6.2},{-12,-6.2}}, color={255,0,255}));
-  connect(mCon_flow.y, masAcc.mCon_flow) annotation (Line(points={{-39,30},{-20,
-          30},{-20,6},{-12,6}}, color={0,0,127}));
+  connect(RepSig.y, masAcc.uRep)
+    annotation (Line(points={{-38,-20},{-20,-20},{-20,-6.2},
+    {-12,-6.2}}, color={255,0,255}));
+  connect(mCon_flow.y, masAcc.mCon_flow)
+    annotation (Line(points={{-39,30},{-20,30},
+    {-20,6},{-12,6}}, color={0,0,127}));
   annotation (experiment(Tolerance=1e-6, StopTime=1.0),
 __Dymola_Commands(file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/AirFilters/BaseClasses/Validation/MassAccumulation.mos"
         "Simulate and plot"),
diff --git a/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassTransfer.mo b/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassTransfer.mo
index c26240773cd..ed263a237e8 100644
--- a/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassTransfer.mo
+++ b/Buildings/Fluid/AirFilters/BaseClasses/Validation/MassTransfer.mo
@@ -44,7 +44,7 @@ model MassTransfer
 equation
   connect(eps.y, masTra.eps)
     annotation (Line(points={{-39,50},{-20,50},{-20,6},{-12,6}},
-            color={0,0,127}));
+    color={0,0,127}));
   connect(traceSubstancesFlow.y, masTra.C_inflow[1])
     annotation (Line(points={{-39,80},{0,80},{0,12}}, color={0,0,127}));
   connect(C_out.port_b, sin.ports[1])
diff --git a/Buildings/Fluid/AirFilters/Empirical.mo b/Buildings/Fluid/AirFilters/Empirical.mo
index 406dac843f8..012c1faca4f 100644
--- a/Buildings/Fluid/AirFilters/Empirical.mo
+++ b/Buildings/Fluid/AirFilters/Empirical.mo
@@ -1,6 +1,6 @@
 within Buildings.Fluid.AirFilters;
 model Empirical "Empirical air filter model"
-  replaceable package Medium =
+    replaceable package Medium =
     Buildings.Media.Air(extraPropertiesNames={"CO2"})
     "Air";
   parameter Real mCon_nominal(
@@ -9,8 +9,7 @@ model Empirical "Empirical air filter model"
   parameter Real epsFun[:]
     "Filter efficiency curve"
     annotation (Dialog(group="Efficiency"));
-  parameter Real b(
-    final min = 1 + 1E-3)
+  parameter Real b
     "Resistance coefficient"
     annotation (Dialog(group="Pressure"));
   parameter Modelica.Units.SI.MassFlowRate m_flow_nominal
@@ -19,7 +18,8 @@ model Empirical "Empirical air filter model"
   parameter Modelica.Units.SI.PressureDifference dp_nominal
     "Nominal pressure drop"
     annotation (Dialog(group="Nominal"));
-
+  parameter String substanceName = "CO2"
+    "Name of trace substance";
   Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uRep
     "Replacing the filter when trigger becomes true"
     annotation (Placement(transformation(extent={{-140,40},{-100,80}})));
@@ -29,7 +29,7 @@ model Empirical "Empirical air filter model"
     final max=1)
     "Filtration efficiency"
     annotation (Placement(transformation(extent={{100,20},{140,60}}),
-        iconTransformation(extent={{100,-80},{140,-40}})));
+    iconTransformation(extent={{100,-80},{140,-40}})));
   Modelica.Fluid.Interfaces.FluidPort_a port_a(
     redeclare package Medium = Medium)
     "Fluid connector a (positive design flow direction is from port_a to port_b)"
@@ -38,6 +38,7 @@ model Empirical "Empirical air filter model"
     redeclare package Medium = Medium)
     "Fluid connector b (positive design flow direction is from port_a to port_b)"
     annotation (Placement(transformation(extent={{90,-10},{110,10}})));
+
 protected
   Buildings.Fluid.AirFilters.BaseClasses.PressureDropWithVaryingFlowCoefficient
     res(
@@ -61,12 +62,27 @@ protected
     final mCon_reset=0)
     "Contaminant accumulation"
     annotation (Placement(transformation(extent={{-40,70},{-20,90}})));
-  Modelica.Blocks.Sources.RealExpression traSubFlo(y(unit="kg/s") = inStream(
-      port_a.C_outflow[1])*port_a.m_flow) "Trace substances flow rate"
+  Modelica.Blocks.Sources.RealExpression traSubFlo(
+    y(unit="kg/s") = inStream(port_a.C_outflow[1])*port_a.m_flow)
+    "Trace substances flow rate"
     annotation (Placement(transformation(extent={{-92,70},{-72,90}})));
   Buildings.Fluid.AirFilters.BaseClasses.FlowCoefficientCorrection kCor(
-    final b=b) "Flow coefficient correction"
+    final b=b)
+    "Flow coefficient correction"
     annotation (Placement(transformation(extent={{60,70},{80,90}})));
+
+  parameter Real s[:]= {
+    if ( Modelica.Utilities.Strings.isEqual(string1=Medium.extraPropertiesNames[i],
+                                            string2=substanceName,
+                                            caseSensitive=false))
+    then 1 else 0 for i in 1:Medium.nC}
+    "Vector with zero everywhere except where species is"
+    annotation(Evaluate=true);
+initial equation
+  assert(max(s) > 0.9, "Trace substance '" + substanceName + "' is not present in medium '"
+    + Medium.mediumName + "'.\n"
+    + "Check filter parameter and medium model.");
+
 equation
   connect(masAcc.mCon, epsCal.mCon)
     annotation (Line(points={{-18,80},{-2,80}},  color={0,0,127}));
@@ -76,22 +92,25 @@ equation
     annotation (Line(points={{-10,0},{50,0}},color={0,127,255}));
   connect(masTra.port_b, port_b)
     annotation (Line(points={{70,0},{100,0}}, color={0,127,255}));
-  connect(masAcc.uRep, uRep) annotation (Line(points={{-42,73.8},{-42,74},{-70,74},
-          {-70,60},{-120,60}}, color={255,0,255}));
-  connect(traSubFlo.y, masAcc.mCon_flow) annotation (Line(points={{-71,80},{-60,
-          80},{-60,86},{-42,86}}, color={0,0,127}));
+  connect(masAcc.uRep, uRep)
+    annotation (Line(points={{-42,73.8},{-42,74},{-70,74},
+    {-70,60},{-120,60}}, color={255,0,255}));
+  connect(traSubFlo.y, masAcc.mCon_flow)
+    annotation (Line(points={{-71,80},{-60,80},
+    {-60,86},{-42,86}}, color={0,0,127}));
   connect(epsCal.y, masTra.eps)
     annotation (Line(points={{22,74},{40,74},{40,6},{48,6}}, color={0,0,127}));
-  connect(masTra.C_inflow[1], traSubFlo.y) annotation (Line(points={{60,12},{60,
-          28},{-60,28},{-60,80},{-71,80}}, color={0,0,127}));
+  connect(masTra.C_inflow[1], traSubFlo.y)
+    annotation (Line(points={{60,12},{60,28},
+    {-60,28},{-60,80},{-71,80}}, color={0,0,127}));
   connect(epsCal.rat, kCor.rat)
     annotation (Line(points={{22,86},{40,86},{40,80},{58,80}}, color={0,0,127}));
   connect(kCor.y, res.kCor)
     annotation (Line(points={{82,80},{90,80},{90,50},{-20,50},{-20,12}},
-        color={0,0,127}));
+    color={0,0,127}));
   connect(epsCal.y, eps)
     annotation (Line(points={{22,74},{40,74},{40,40},{120,40}},
-        color={0,0,127}));
+    color={0,0,127}));
 
 annotation (defaultComponentName="airFil",
 Icon(coordinateSystem(preserveAspectRatio=false), graphics={
@@ -294,14 +313,16 @@ Buildings.Fluid.AirFilters.BaseClasses.FiltrationEfficiency</a> and
 Buildings.Fluid.AirFilters.BaseClasses.FlowCoefficientCorrection</a>.
 </p>
 <p>
-The input boolean flag, <code>uRep</code>, triggers the filter replacement.
+The input boolean flag, <code>uRep</code>, triggers the filter replacement:
+<br/>
 When <code>uRep</code> changes from <code>false</code> to <code>true</code>, the
-mass of the captured contaminant becomes zero.
+mass of the captured contaminant becomes <i>0</i>.
 </p>
 <b>Note:</b>
 <p>
 A warning will be triggered when the captured contaminant mass becomes greater than the
 maximum contaminant mass (<code>mCon_nominal</code>).
+<br>
 In addition, the <code>extraPropertiesNames</code> has to be defined in the medium model.
 </p>
 </html>", revisions="<html>
diff --git a/Buildings/Fluid/AirFilters/Examples/Empirical.mo b/Buildings/Fluid/AirFilters/Examples/Empirical.mo
index 1046292ea5a..3a06f7fc569 100644
--- a/Buildings/Fluid/AirFilters/Examples/Empirical.mo
+++ b/Buildings/Fluid/AirFilters/Examples/Empirical.mo
@@ -46,10 +46,12 @@ model Empirical "Example for using the empirical air filter model"
     "Trace substance sensor of outlet air"
     annotation (Placement(transformation(extent={{40,-10},{60,10}})));
 equation
-  connect(repSig.y, fil.uRep) annotation (Line(points={{-28,50},{-4,50},{-4,6},{
-          2,6}}, color={255,0,255}));
-  connect(C_inflow.y, sou.C_in[1]) annotation (Line(points={{-73,22},{-68,22},{-68,
-          -8},{-62,-8}}, color={0,0,127}));
+  connect(repSig.y, fil.uRep)
+    annotation (Line(points={{-28,50},{-4,50},{-4,6},{2,6}},
+    color={255,0,255}));
+  connect(C_inflow.y, sou.C_in[1])
+    annotation (Line(points={{-73,22},{-68,22},{-68,-8},
+    {-62,-8}}, color={0,0,127}));
   connect(C_out.port_b, sin.ports[1])
     annotation (Line(points={{60,0},{72,0}}, color={0,127,255}));
   connect(C_out.port_a, fil.port_b)