diff --git a/schemas/BaseElements.xsd b/schemas/BaseElements.xsd
index 5b88915e..1cc487f6 100644
--- a/schemas/BaseElements.xsd
+++ b/schemas/BaseElements.xsd
@@ -1165,6 +1165,9 @@
 												<xs:documentation>[W]</xs:documentation>
 												</xs:annotation>
 												</xs:element>
+												<xs:element maxOccurs="unbounded" minOccurs="0"
+												name="ThirdPartyCertification"
+												type="VentilationFanThirdPartyCertification"/>
 												<xs:element minOccurs="0" ref="extension"/>
 											</xs:sequence>
 										</xs:complexType>
diff --git a/schemas/HPXMLDataTypes.xsd b/schemas/HPXMLDataTypes.xsd
index a49688d6..b9034020 100644
--- a/schemas/HPXMLDataTypes.xsd
+++ b/schemas/HPXMLDataTypes.xsd
@@ -1798,6 +1798,13 @@
 			<xs:enumeration value="CFMnat"/>
 		</xs:restriction>
 	</xs:simpleType>
+	<xs:simpleType name="VentilationFanThirdPartyCertification">
+		<xs:restriction base="xs:string">
+			<xs:enumeration value="Energy Star"/>
+			<xs:enumeration value="Home Ventilation Institute"/>
+			<xs:enumeration value="other"/>
+		</xs:restriction>
+	</xs:simpleType>
 	<xs:simpleType name="Recommendation">
 		<xs:restriction base="xs:string">
 			<xs:enumeration value="require"/>