diff --git a/include/ExitAirTempSensor.hpp b/include/ExitAirTempSensor.hpp
index 1e774cf..70c3f68 100644
--- a/include/ExitAirTempSensor.hpp
+++ b/include/ExitAirTempSensor.hpp
@@ -10,9 +10,9 @@
 struct CFMSensor : public Sensor
 {
     std::vector<std::string> tachs;
-    int32_t c1;
-    int32_t c2;
-    int32_t maxCFM;
+    double c1;
+    double c2;
+    double maxCFM;
     double tachMinPercent;
     double tachMaxPercent;
 
diff --git a/include/Utils.hpp b/include/Utils.hpp
index 7f24e21..d65fb83 100644
--- a/include/Utils.hpp
+++ b/include/Utils.hpp
@@ -26,6 +26,9 @@
 using SensorData = boost::container::flat_map<
     std::string, boost::container::flat_map<std::string, BasicVariantType>>;
 
+using GetSubTreeType = std::vector<
+    std::pair<std::string,
+              std::vector<std::pair<std::string, std::vector<std::string>>>>>;
 using SensorBaseConfiguration =
     std::pair<std::string,
               boost::container::flat_map<std::string, BasicVariantType>>;
@@ -57,6 +60,20 @@
     always
 };
 
+namespace mapper
+{
+constexpr const char* busName = "xyz.openbmc_project.ObjectMapper";
+constexpr const char* path = "/xyz/openbmc_project/object_mapper";
+constexpr const char* interface = "xyz.openbmc_project.ObjectMapper";
+constexpr const char* subtree = "GetSubTree";
+} // namespace mapper
+
+namespace properties
+{
+constexpr const char* interface = "org.freedesktop.DBus.Properties";
+constexpr const char* get = "Get";
+} // namespace properties
+
 template <typename T>
 inline T loadVariant(
     const boost::container::flat_map<std::string, BasicVariantType>& data,
diff --git a/include/sensor.hpp b/include/sensor.hpp
index 2a414da..3d81f1f 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -4,6 +4,8 @@
 #include <sdbusplus/asio/object_server.hpp>
 
 constexpr size_t sensorFailedPollTimeMs = 5000;
+
+constexpr const char* sensorValueInterface = "xyz.openbmc_project.Sensor.Value";
 struct Sensor
 {
     Sensor(const std::string& name, const std::string& path,