When purchasing a haunted house attraction, you must prioritize structural integrity and material safety. Ensure the frame uses galvanized steel to prevent rust, especially for outdoor setups. For interior panels, specify fire-retardant materials (Class A or B1 rating) to comply with international fire codes. Additionally, verify the load-bearing capacity of floors if the attraction involves multiple levels, and ensure all pneumatic or hydraulic animatronics operate on standard industrial voltages (e.g., 110V/220V) with emergency stop overrides.