MoistureProof 12V DC 80mm Fan 8038 Small Computer Muffin Exhaust Vent Case Fan with 110V 120V 220V Speed Controller 3.3V12V 15005000RPM Variable Speed. trend of dc 12 volt moistureproof muffin fan that designed for high humidity 80% cooling ventilation projects, verified test up to 4cm water for 4 hours. 80mm fan 12v big airflow small electric fan with long lasting dual ball bearing provides up to 60000 hours over 6 years life. With a 3.3v12v speed controller, the small window fan can achieve different airflow 19.565CFM and noise level2153.2dBA according to required. Increases the maximum fan speed and enables the fan to be powered through an outlet, just plugging it into an outlet to start the fan. Specifications. Fan Size 80 mm. Color Black. Weight 0.86 lbs