A standard cooling fan is essentially a bladed DC motor. By varying the voltage input across the acceptable range for a fan, the speed of the fan will increase (to added voltage) and decrease (to reduced voltage); a faster fan means more air moved and thus a higher heat exchange rate.
Contact them toll-free from a Vodacom cellphone by dialing 111. Contact them toll-free from a Telkom phone by dialing 0800-111-234. Note: Telkom toll-free numbers are generally NOT toll-free when dialed from a MTN/Vodacom cellphone.
Vodafone: 0870 183 0612. Contact Vodafone on their 24-hour customer service phone number 0870 183 0612 / 0843 504 3747. Introducing Vodafone. Vodafone was one of the first phone companies to launch 4G technology in the UK, and, in 2014, went one better by launching 4.5G technology in London.