Added trickle vents recommendation

recommendations/Recommendations.py

@@ -131,6 +131,10 @@ class Recommendations:
             if self.ventilation_recomender.recommendation:
                 property_recommendations.append(self.ventilation_recomender.recommendation)
 
+        if "trickle_vents" in measures:
+            # This is a recommendatin that typically comes from an energy assessment
+            property_recommendations.append(self.ventilation_recomender.recommend_trickle_vents())
+
         if "floor_insulation" in measures:
             self.floor_recommender.recommend(phase=phase, measures=measures)
             if self.floor_recommender.recommendations:

recommendations/VentilationRecommendations.py

@@ -81,3 +81,42 @@ class VentilationRecommendations(Definitions):
                 "labour_days": labour_days  # Assume 8 hour day
             }
         ]
+
+    def recommend_trickle_vents(self):
+        """
+        This is not something that we can identify completely non-invasively, however a recommendation which may come
+        about as a result of an energy assessment is the installation of trickle vents. This function handles that
+        """
+
+        trickle_vents_recommendation_config = [
+            r for r in self.property.non_invasive_recommendations if r["type"] == "trickle_vents"
+        ][0]
+
+        description = (
+            "Install trickle vents to windows without them" if
+            not trickle_vents_recommendation_config.get("description")
+            else trickle_vents_recommendation_config["description"]
+        )
+
+        # We recommend installing two mechanical ventilation systems
+        self.recommendation = [
+            {
+                "phase": None,
+                "parts": [],
+                "type": "trickle_vents",
+                "description": description,
+                "starting_u_value": None,
+                "new_u_value": None,
+                "already_installed": False,
+                "sap_points": trickle_vents_recommendation_config["sap_points"],
+                "heat_demand": 0,
+                "kwh_savings": 0,
+                "co2_equivalent_savings": 0,
+                "energy_cost_savings": 0,
+                "total": trickle_vents_recommendation_config["cost"],
+                # We use a very simple and rough estimate of 4 hours per unit
+                "labour_hours": trickle_vents_recommendation_config.get("labour_hours", 8),
+                "labour_days": trickle_vents_recommendation_config.get("labour_days", 1),  # Assume 8 hour day
+                "survey": True
+            }
+        ]