WC‑15 Variable Speed Fan Controller – 5A, Dial Control with On/Off Switch, RFI Filter, Brushed Aluminum Plate Powder Coated + Product Details Outer dimensions:

+ Product Details Outer dimensions: 21

Powder-Coat Finish – smooth

+ Product Details Size – 16"w X 30"h is the size for the duct opening measurement only

For example

WC‑15 Variable Speed Fan Controller – 5A, Dial Control with On/Off Switch, RFI Filter, Brushed Aluminum Plate Powder Coated + Product Details Outer dimensions:+ Product Details Compatible replacement for WC15 series speed controllers Variable fan speed dial with integrated on off switch Rated for 115 VAC, 50 60 Hz operation with 5 Amp max load Built in RFI (Radio Frequency Interference) filter for clean operation Adjustable minimum speed via internal trimpot Brushed aluminum wall plate with matching silver control knob Includes mounting hardware and standard 6 pre stripped wire leads Fits standard 2 4