... inner environment; two options, one is single speed, one is variable speed circulation. Product description Stainless steel casing, big ... , low noise, low power consumption Single and variable speed models are available. NameModelVoltageFrenquencyPowerRMPAir flowFLC circulation fan ZLFJ400220V ... /110V 50HZ 350W 1380r/min5700m3/hFLC Circulation fan variable speed ZLFJ400T 220V/110V 50HZ 45-100W 780-1320r ...