blackcabbage.com

The material we keep in our warehouse is not normally heat sensitive but we like to be sure that it does not go above a certain temperature.  In order to keep this from happening we have large industrial extractor fans installed in one wall.  When the temperature reaches the set point the fans kick in.  The pressure opens the louvered covers and let the hot air flow out.   On the other side of the warehouse another set of louvered doors open when the air pressure drops and allows the cooler air from outside to circulate throughout the room until the temperature drops ten degrees.