How to insert an obstacle (e.g. a boiler).
Step 1: Choose Insert Obstacle.
Step 2: In the floor plan, select the wall ceiling from which you are measuring the obstacle.
Step 3: Measure the distance d1,
Top height (upper edge of the obstacle to the ground),
Bottom height (lower edge of the obstacle to the floor)
and the distance to the wall.
Step 4: End the command with OK.