Do you think this relay will work good for my exhaust fan? The fan is 110v. I see on your pictures the relays have some diodes. Will I need them also?
That is a 120VAC coil relay. For the output of the controller to operate the relay you will need a 24VDC coil. The contacts of the relay can be any voltage (AC or DC). The diode across the coil helps protect the output circuitry of the controller from back EMF when the relay is de-energized. It’s a good idea to include that. Automation direct offers a relay with the diode built in (QL2X1-D24). You can also add your own diode across the coil.
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