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Robert,
I am not interested in an ERV.  I have not been able to source p.o.u. HRV.
Have you ever tempered incoming air on a HRV, or do you not think they are
efficient enough for cold climates?

Ben


On 4/7/09 1:17 PM, "Robert Riversong" <[log in to unmask]> wrote:

> Ben, et al:
>  
> The Panasonic FV-04VE1 seems like a higher-tech version of the old Mitsubishi
> point-of-use HRV, except the Panasonic is an ERV which exchanges moisture as
> well.
>  
> If one of the purposes of an exhaust fan is to evacuate moisture, then it
> makes no sense to recycle it back in (other than saving the latent heat of the
> water vapor). Also, like all ERVs, this one is less than ideal in a cold
> climate.
>  
> To prevent freeze-up, instead of an electric resistance defroster (which some
> larger units have), the Panasonic simple closes off the incoming air for a
> while - making it an exhaust-only fan. So if the purpose is also to keep the
> indoor pressure balanced, it won't do that in weather below 32 very well and
> not at all below 20.
> 
> --- On Tue, 4/7/09, Ben Graham <[log in to unmask]> wrote:
>> From: Ben Graham <[log in to unmask]>
>> Subject: Re: Point vent heat exchangers
>> To: [log in to unmask]
>> Date: Tuesday, April 7, 2009, 11:58 AM
>> 
>> Thanks,
>> Any experience with this one?
>> 
>> 
>> On 4/7/09 11:12 AM, "Konrad Scheltema"
>> <[log in to unmask]>
>> wrote:
>> 
>>> > Panasonic has one in their whisper line
>>> > 
>>> > Konrad
>>> > 
>>> > 
>>> > On Apr 7, 2009, at 10:54 AM, Ben Graham wrote:
>>> > 
>>>> >> Does anyone know of domestically available point source heat exchange
>>>> >> ventilator like the vent-axia from abroad?
>>>> >> 
>>>> >> Ben
>>>> >> 
>>>> >> Those who give up freedom for safety, deserve neither.
>>>> >> Benjamin Franklin
>>>> >> __________________________________________________________
>>>> >> 
>>>> >> Ben Graham
>>>> >> www.naturaldesignbuild.us
>>>> >> Natural building/design services/workshops/consulting
>>>> >> 
>>>> >> Integrating Culture and Nature
>>>> >> 802.454.1167
>>> > 
>>> > Konrad Scheltema
>>> > 
>>> > Evergreen Homebuilders LLC
>>> > 121 March Davis Drive
>>> > Guilford, VT 05301
>>> > 
>>> > Phone/Fax (802) 246-1600
>>> > Cell   (802)380-6437
>>> > email  [log in to unmask]
>>> > Web  www.evergreen-homebuilders.biz
>> 
>> Those who give up freedom for safety, deserve neither.
>> Benjamin Franklin
>> __________________________________________________________
>> 
>> Ben Graham
>> www.naturaldesignbuild.us
>> Natural building/design services/workshops/consulting
>> 
>> Integrating Culture and Nature
>> 802.454.1167
> 


Those who give up freedom for safety, deserve neither.
Benjamin Franklin
__________________________________________________________

Ben Graham
www.naturaldesignbuild.us
Natural building/design services/workshops/consulting

Integrating Culture and Nature
802.454.1167