diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index a1ec7d68..e738f381 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -776,9 +776,15 @@ class EpcPropertyDataMapper:
             heated_rooms_count=schema.heated_room_count,
             wet_rooms_count=0,
             extensions_count=schema.extensions_count,
-            open_chimneys_count=0,
+            open_chimneys_count=schema.open_fireplaces_count,
             insulated_door_count=schema.insulated_door_count,
             draughtproofed_door_count=None,
+            percent_draughtproofed=schema.percent_draughtproofed,
+            # ADR-0028: sheltered_sides must come from built_form, else the
+            # calculator assumes mid-terrace (2) for every dwelling.
+            sap_ventilation=SapVentilation(
+                sheltered_sides=_api_sheltered_sides(schema.built_form),
+            ),
             # ADR-0028: 18.0 gives total + low-energy OUTLET counts, not an
             # LED/CFL/incandescent split. Low-energy -> the calculator's LEL
             # path; the remainder is incandescent (1 outlet ~= 1 bulb).