When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission.
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network
The primary function of the air pressure switch is to determine whether the primary air circulator is actually running. This is part of a small, but important collection of hardware devices made to keep everyone in the house safe. The vast majority of pressure switches made today may have a manual reset, which forces the system to be reset physically or the entire system will not run.