Joseph Meehan wrote:

G wrote:

Is this thing just a fan with a humistat control or is there more to it?

http://www.humidexatlantic.com/

Our hvacrmedic might enjoy this.

Well since they don't say how it is suppose to work, I would guess it
is nothing more than a fan.

There's a "how it works" section...

***

Humidex is a mechanical ventilation unit engineered to exhaust the moist,
musty and contaminated air that becomes trapped in the house due to the poor
circulation of indoor air... Ventilating excess humidity... High relative
humid air, Molds, Musty Odors and Gases are expelled to the outside via
the Humidex unit, and replaced with Fresh Air from upstairs.

Cool moist air is heavy and will gravitate to the lowest point, namely to
the basement of the house. The basement floor is also cold and will condense
when in contact with moisture seeping in or coming down. In poorly ventilated
areas, the damp air stagnates and creates an environment conducive to mold
growth, structural damage and discomfort. When a Humidex is installed and
operating, this stale, humid, contaminated air is drawn to the bottom vents
of the unit by a... [200 cfm fan.]

It is then expelled to outside of the house through a 6" duct... This [air]
is then replaced with a flow of relatively drier, warmer and fresher air
drawn downward from the upper levels. The interior air is then replaced with
cleaner, fresher outdoor air entering the home naturally via windows, doors,
cracks, etc. The warmer replenishment air raises the surface temperature
which lowers relative humidity. Humidex continues to expel this moist air
until the desired preset humidity level is reached...

Unit is automatically controlled by an adjustable humidistat... When the
desired level of humidity is achieved, the fan will reduce speed. It will
resume a higher speed if humidity level increases. The direct effect of the
air being expelled and the flow of air downwards, creates an air exchange
of approximately 10 times a day. As the moisture is drawn off the surface,
the moisture absorbed in the walls and floor comes to the surface and is
then expelled.

The unit automatically monitors the relative humidity and adjusts the
ventilation rate. In the summer set the humidistat control to between 50-60
percent and in the winter between 40-50 percent. The fan should be set at
the high speed... The fan will expel the moist air and will automatically go
to a minimal speed, after it has reduced the relative humidity to the desired
level. The unit never shuts off providing constant ventilation.

***

The claims don't make sense.

Which claims do not make sense? How?

There are certain laws of physics that would be violated if it did
what it says it does.

Which laws? How? What happens on a humid summer day?

Nick

PS: They never mention the price on their web page with scary language and
anonymous testimonials. Click on "satisfaction guaranteed" to produce their
10-year parts guarantee, with a notice that this is their only guarantee,
and it does not include any "fitness for purpose."