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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 exhaustfan 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