Both have bearings. 

Karl Wolz
Sent from my electronic umbilicus

> On Jan 2, 2016, at 5:29 PM, Jim Felder <jim.felder@gmail.com> wrote:
> 
> No, Edward best I can guess. Point is one has an electric motor the other does not..
> 
> Jim
> 
> Sent from my iPad
> 
>> On Jan 2, 2016, at 5:19 PM, Karl Wolz <wolzphoto@q.com> wrote:
>> 
>> You talkin to me??
>> 
>> I know the difference; have both. Both relatively low tech. 
>> 
>> Karl Wolz
>> Sent from my electronic umbilicus
>> 
>>> On Jan 2, 2016, at 4:03 PM, Jim Felder <jim.felder@GMAIL.COM> wrote:
>>> 
>>> A swamp cooler is an evaporative cooler with a fan. Way different from a roof turbine. 
>>> 
>>> Jim
>>> 
>>> Sent from my iPad
>>> 
>>>> On Jan 2, 2016, at 3:42 PM, Edward Maglott <emaglott3@GMAIL.COM> wrote:
>>>> 
>>>> that sounds a lot less impressive.  it does mention furnace blowers as one
>>>> of it's main applications.
>>>> Edward
>>>> 
>>>>> On Sat, Jan 2, 2016 at 3:32 PM, Karl Wolz <wolzphoto@q.com> wrote:
>>>>> 
>>>>> I believe they're referring to the turbines mounted on home roofs. Low
>>>>> speed and low resistance with no motor.
>>>>> 
>>>>> Karl Wolz
>>>>> Sent from my electronic umbilicus
>>>>> 
>>>>>> On Jan 2, 2016, at 11:56 AM, David Beierl <dbeierl@ATTGLOBAL.NET> wrote:
>>>>>> 
>>>>>> I don't lay any particular importance to
>>>>>> the "turbine" designation.  I
>>>>>