02-03-15   

Model B: Damp weather humidistat, mounts behind an intake vent, opposite the side where the power vent is mounted. Power vents stay off when the humidity is above the setting. The vent turns on when humidity is below the setting or if there is a quick rise in humidity, so that the unit turns off when it is raining.

Model C: Turns unit on when humidity in crawl space rises above a pre set limit, usually set at 50% humidity.

The difference between the 2 controllers is the conditions that they shut off. The Humidistat B - HUB (damp weather shut off) is recommended to be set at 75% Relative Humidity. The operation of it will cause it to shut down at any Relative Humidity above the set point. The Humidistat C - HUC is the opposite, it will turn on at any condition above the set point. Operation is such that the 2 controllers when plugged together in series will maintain the humidity in the crawl space between the set points on the controllers.

For example, the Humidistat B - HUB set at 75% and the Humidistat C - HUC set at 40% will run at anytime the crawl space has a humidity below 75% and above 40%. If the humidity drops below 40% the Humidistat C - HUC will shut off and the fan will no longer run. If the humidity in the space goes above 75% the Humidistat B - HUB will shut off and the fan will no longer run. The Humidistat B - HUB is intended to be placed in the air stream of the incoming outside air, therefore, if it is raining or humid out and the fan comes on and starts bringing in air above the Humidistat B - HUB set point (75%), the Humidistat B - HUB will turn off and the fan will stop.

The obvious down side to this is that if the crawl space rises above the set point of the Humidistat B - HUB , the fan will not turn on. However, without the Humidistat B - HUB , the Humidistat C - HUC would turn on at anytime the crawlspace was above its set point and run the fan, it could very well bring in more humid air than is already in the crawlspace, such as when it was raining outside.

The foundation is critical to the integrity of the home. That’s why foundation ventilation is critical. Unventilated foundations are subject to built-up moisture that can eventually lead to costly damage.

Temp Vent foundation vent systems help protect this critical area of the home. What’s more, ventilation can help control conditions that lead to mold, mildew, fungi, damp rot and unhealthy air.

But there’s more. If there’s one thing termites are attracted to, it’s warm, moist, dead air environments such as those found under houses in crawl spaces or unfinished basements. Temp-Vent products have been especially designed for the pest control industry.

Temp-Vent foundation vents help to provide ventilation that can reduce moisture in these areas, which helps control termites.

TempVents are available from your local Pest Control Supply Company
or nationally at the following companies:

Visit: Wildlife Control Supplies .com

Or Pest Control of America .com

Pestrong.com

Sometimes even on Ebay:
http://www.ebay.com/itm/Crawl-Space-Vent-Temp-Vent-Two-Piece-Unit-/270459581020