Hazardous Mataterial - Recognizing and Identifying the Hazards No. 2 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 4 of 20 4.  A plastic curtain that is hung across a passage way and opens to allow miners and equipment to pass through is considered a: Choices: Airlock Temporary bulkhead Line brattice Check curtain