Zippered protective plastic for doorways and undercuts. It effectively stops dust from moving out of the insulated area while making it easy to get into the space.

Spread the door over the entrance to the room you're protecting and tape it to the frames. Thanks to the closable zipper, dust inside the room won't escape during work. You can also use it with temporary partitions to split the room into two different sections. Made from thick plastic, so the door won't tear easily in use.