Secure the windows for the poison gaslast hint

There are three windows in the farmhouse. All of those should be shut down for the imminent threat.

2 hints available

What blocks gas?

Try to find some plastic wrappers to seal the windows.

There are plastic wraps at the gas station.

How do I fix the plastics into place?

You can use duct tape

or hammer and nails.

You find duct tape inside the van at the roadblock, when you open the locker.