We see that there is an upper limit of 140F but we are curious about the lower operating limit of the exhaust stream. Could you please provide this data?

The Fantech FKD 12XL does not have a strict minimum air stream temperature rating, meaning it can operate in sub-freezing, sub-zero environments. However, operating in cold air requires attention to condensation and ice buildup that could restrict the impeller. Please give us a call so we can further assist you, thanks!