What to inspect
Compare direct vent exposure, room humidity trend, leaf wetness, root-zone moisture, heat, and evidence of mites.
Choose one evidence-based action
Move away from direct airflow and stabilize conditions. Use a measured room-level change when needed; avoid keeping foliage continuously wet.
What not to do
Do not diagnose humidity from one mark, change several major conditions at once, or use an unlabeled treatment. Old damage may remain after the cause is corrected.
Review the outcome
Photograph the same area under similar light, record the date and intervention, then compare the boundary of damage and the quality of new growth. Escalate rapid decline or safety concerns to an appropriate professional.