From 5a9ff39eec3af282a77826b848e591a697a1994b Mon Sep 17 00:00:00 2001
From: omicron <omicron.me@protonmail.com>
Date: Tue, 9 Jun 2026 14:23:59 +0200
Subject: [PATCH] Add room system for ventilation loss calculation

---
 ventilation.py | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 ventilation.py

diff --git a/ventilation.py b/ventilation.py
new file mode 100644
index 0000000..0f376e0
--- /dev/null
+++ b/ventilation.py
@@ -0,0 +1,46 @@
+from dataclasses import dataclass
+from enum import Enum, auto
+
+
+class RoomKind(Enum):
+    # Wet rooms
+    OPEN_KITCHEN = auto()
+    KITCHEN = auto()
+    TOILET = auto()
+    OTHER_WET = auto()
+
+    # dry rooms
+    LIVING_ROOM = auto()
+    OTHER_DRY = auto()
+
+
+# https://belglas.com/wp-content/uploads/2016/04/ventilatiedocumentresidentieel.pdf
+_RANGES = {
+    RoomKind.OPEN_KITCHEN: (75, float("inf")),
+    RoomKind.KITCHEN: (50, 75),
+    RoomKind.TOILET: (25, 25),
+    RoomKind.OTHER_WET: (50, 75),
+    RoomKind.LIVING_ROOM: (75, 150),
+    RoomKind.OTHER_DRY: (25, 72),
+}
+
+
+def _clamp(x, low, high):
+    return min(max(x, low), high)
+
+
+@dataclass
+class Room:
+    kind: RoomKind
+    area: float
+
+    @property
+    def is_wet(self) -> bool:
+        return self.kind not in {RoomKind.LIVING_ROOM, RoomKind.OTHER_DRY}
+
+    @property
+    def flow_rate(self) -> float:
+        if self.kind == RoomKind.TOILET:
+            return 25
+        rate = 3.6 * self.area
+        return _clamp(rate, *_RANGES[self.kind])