AC Infinity RAXIAL S4 Inline Booster Duct Fan with Speed Controller, 4" SHIP_BULK Q: What is the silver

Q: What is the silver screw under the green button

vitamin B1 and humic acid

Ballast Factor: 1

AC Infinity CLOUDLINE T8

(20 feet)    Product and Mounting Dimensions - Controller    Total Dimensions    5

AC Infinity RAXIAL S4 Inline Booster Duct Fan with Speed Controller, 4" SHIP_BULK Q: What is the silverAC Infinity RAXIAL S4 Inline Booster Duct Fan with Speed Controller, 4" A duct fan designed to boost airflow in HVAC systems and ventilate home spaces like attics and workshops. Features a variable fan speed controller, enabling you to optimize airflow and noise level for any application. Unibody die cast construction with no welded seams; reduces vibration while ensuring smoother airflow. AC brushless motor with steel blades and lubricated bearings;