For regulation of fan or blower control Cut-In – 120 Degree (49 Degree), Cut-Out – 110 Degree (43 Degree) Designed for quick on-job replacement Mounting holes match standard 3/4″ snap discs The White Rodgers 3F01-120 Snap Disc Fan Control is designed for quick on-job replacement. This is a SPST flanged airstream mount, close on rise control.