ITEM NAME:DC 12v pwm pc cpu fan temperature control speed controller module Gw.TFL (No. 1): The lowest temperature channel PWM setting, when ON state FAN1 PWM minimum is 40%, when OFF the minimum PWM of FAN1 is 20%. Stall alarm minimum speed: 700-800 rpm. Thermostat temperature zone error: error depending on the temperature probe, generally 3-5%.