How to Wire an Electric Fan with a Relay on a Classic Car
hvac - How to Sync Booster Fan with Furnace Fan - Home Improvement Stack Exchange
It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I want each bathroom light switch to control the fan, so when the lighting turns on in either bathroom, the fan will go on. If both light switches are off, the fan will go off. If one light is on the fan will stay on.
Connecting a thermostat to a relay to start a fan
However, before going through the procedure, make sure to take precaution and wear safety goggles. The electrical junction box must be connected by using self-drilling sheet metal screws. These metal screws need to have a maximum length of one inch. The electrical box mounting holes must not be pre-drilled.
As many of you know, clearance between the front of your engine and radiator can be very tight. Dual electric fans could be the solution to your cooling issues. Dual electric fans have several benefits, like being able to pull more cfm between the two fans versus having just one fan, also allowing more clearance for front engine accessories. There are several ways that a dual fan can be wired. For example, dual thermostat switches or dual relays could be used to control each fan separately.