The essential tools for efficient grow room ventilation are: An extractor fan: to remove stale air, heat, and humidity from your grow tent. A carbon filter: to eliminate odors and filter out dust and pathogens from your exhaust air. A ducting: to connect your extractor fan and carbon filter and direct the exhaust air outside or into another room. An intake fan (optional): to supply fresh air into your grow tent. A speed controller (optional): to adjust the speed and noise of your fans. A hygrometer: to monitor the humidity levels in your grow tent. A thermometer: to measure the temperature in your grow tent.