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.
You can choose to use your mobile phone to get information or call from a landline, in some cases. 1  Customer Service: *611 (from mobile phone) or 1-800-922-0204. 2  Customer Service Prepaid: *611 (from mobile phone) or 1-888-294-6804. 3  Consumer Sales: 1-800-256-4646.  Business Sales: 1-800-899-4249.