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Great Article on Heat Recovery and Energy Recovery Ventilation

2 years 7 months ago #36334 by mikeg2929
I got mine after I saw Sam Millers. Mike Helford got one after that, too.

A humidistat leads me to believe you are looking for a "st it and forget it" solution. The ERV removed humidity from the indoor air, but not from the outdoor air ( I think). That's why in the summer you don't run it as you will be bringing in humid air back into your house. In the Summer I just ran a bathroom ran I installed on an on / off cycle. A humidistat would add value when the humidity is low outside, but honestly these are such a low power draw, running it 24 / 7 during winter / fall / early spring would cost much.

You'll see in the instructions - the in flow and outflow pipes must be far from each other. My unit was 20 feet (straight shot) from my fish room and the fresh air return was next to the machine. It made for a very nice airflow and you can feel the benefits almost immediately. Use heavy gauge (green) pvc pipes so that you wont get condensation dripping on your floor. Vent through the wall with a dryer (screened). I used canvas straps to attach the unit to the joists. That way I could have access to the whole unit without worrying about a side touching the ceiling or wall. It too 6 hours to install. Plus 12 beers. If you are building the new room, its a must have,

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2 years 7 months ago #36333 by forumadmin
Here's what I am looking at:
Fantech SE - 56 CFM - Energy Recovery Ventilator (ERV) - Side Ports - 4" Duct

and controlled by:

Fantech Dehumidistat - 4-Wire

Not sure what humidity level to run it at. I think I heard 40-50%.

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2 years 7 months ago #36331 by mikeg2929
High humidity will destroy your house if left unabated. I had one of these in my old house and the impact was dramatic. The room temp was still warm, but it wasn't humid and unpleasant.

In the new house I used a vapor barrier and green board. I had a weather tight door and ran a bathroom fan 1 hour every 4. It worked, but not as well as the air exchanger.

Jehmco sold them, but the small units are discontinued. I ran mine continuously in the cold months and turned it off in the late spring - through fall. If the outside air is humid, the air exchanger doesnt add value.

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2 years 7 months ago #36330 by forumadmin
Discovering Recovery Ventilation

If found this interesting and helpful. The idea of these devices is that they exchange moist air from the fishroom with outside air while recovering heating/cooling energy.

I believe these devices can be hooked to a humidistat or run on a cycle.

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