diff --git a/src/energyplus/ForwardTranslator.cpp b/src/energyplus/ForwardTranslator.cpp
index 2a5a03730f..1caf909689 100644
--- a/src/energyplus/ForwardTranslator.cpp
+++ b/src/energyplus/ForwardTranslator.cpp
@@ -379,9 +379,12 @@ namespace energyplus {
       // That includes the Space ones too.
       // SpaceInfiltrationEffectiveLeakageAreas and SpaceInfiltrationFlowCoefficients don't need it, they are always absolute
       for (auto& infil : model.getConcreteModelObjects<SpaceInfiltrationDesignFlowRate>()) {
-        // TODO: technically we only need to do that if the space it's assigned to is part of a thermalzone with more than one space
-        // Same reason as above: not doing it for now
-        infil.hardSize();
+        // technically we only need to hardsize if the space it's assigned to is part of a thermalzone with more than one space
+        if (!openstudio::istringEqual("Flow/Space", infil.designFlowRateCalculationMethod())) {
+          if (infil.space() && infil.space()->thermalZone() && infil.space()->thermalZone()->spaces().size() > 1) {
+            infil.hardSize();  // translates to Flow/Zone
+          }
+        }
       }
     }
 
diff --git a/src/energyplus/Test/SpaceInfiltrationDesignFlowRate_GTest.cpp b/src/energyplus/Test/SpaceInfiltrationDesignFlowRate_GTest.cpp
index 8b78f06b06..d1d2fb8d8a 100644
--- a/src/energyplus/Test/SpaceInfiltrationDesignFlowRate_GTest.cpp
+++ b/src/energyplus/Test/SpaceInfiltrationDesignFlowRate_GTest.cpp
@@ -90,6 +90,33 @@ TEST_F(EnergyPlusFixture, ForwardTranslator_SpaceInfiltrationDesignFlowRate) {
   EXPECT_FALSE(objects[0].getDouble(ZoneInfiltration_DesignFlowRateFields::AirChangesperHour));
 }
 
+TEST_F(EnergyPlusFixture, ForwardTranslator_SpaceInfiltrationDesignFlowRate_SpaceTranslation) {
+  Model model;
+
+  ThermalZone zone(model);
+
+  Space space(model);
+  space.setThermalZone(zone);
+
+  SpaceInfiltrationDesignFlowRate infiltration(model);
+  infiltration.setAirChangesperHour(0.1);
+  infiltration.setSpace(space);
+
+  ForwardTranslator ft;
+  Workspace workspace = ft.translateModel(model);
+
+  std::vector<WorkspaceObject> objects = workspace.getObjectsByType(IddObjectType::ZoneInfiltration_DesignFlowRate);
+  ASSERT_EQ(1u, objects.size());
+
+  ASSERT_TRUE(objects[0].getString(ZoneInfiltration_DesignFlowRateFields::DesignFlowRateCalculationMethod));
+  EXPECT_EQ("AirChanges/Hour", objects[0].getString(ZoneInfiltration_DesignFlowRateFields::DesignFlowRateCalculationMethod).get());
+  EXPECT_FALSE(objects[0].getDouble(ZoneInfiltration_DesignFlowRateFields::DesignFlowRate));
+  EXPECT_FALSE(objects[0].getDouble(ZoneInfiltration_DesignFlowRateFields::FlowperZoneFloorArea));
+  EXPECT_FALSE(objects[0].getDouble(ZoneInfiltration_DesignFlowRateFields::FlowperExteriorSurfaceArea));
+  ASSERT_TRUE(objects[0].getDouble(ZoneInfiltration_DesignFlowRateFields::AirChangesperHour));
+  EXPECT_EQ(0.1, objects[0].getDouble(ZoneInfiltration_DesignFlowRateFields::AirChangesperHour).get());
+}
+
 TEST_F(EnergyPlusFixture, ForwardTranslator_SpaceInfiltrationDesignFlowRate_SpaceTypes) {
 
   Model m;