Hey! Honestly, don't keep them sealed up in that room for the whole cycle. Spider mites have a very fast lifecycle, and sealing a room for days or weeks usually doesn't kill all the eggs—it just stresses the plants and creates a breeding ground for mold and humidity issues, especially since they are already 4 weeks old.
If the infestation is that severe and your main flower tent is just 6 feet away, those 4 plants are a massive risk to your main harvest. Keeping them around is like playing with fire.
Here is what I would do:
1. Cull them: Honestly, at 4 weeks old, if they are heavily infested and you already sprayed the room, it's often safer to just bag them up, toss them out, and thoroughly sterilize that small space before starting over.
2. Protect the main tent: Check your main flower tent immediately to make sure the mites haven't migrated over (use preventive measures or beneficial insects if needed).
Don't risk your main crop for 4 veg-stage autos. Safety first!