will a fast charger work on my iPad 5?

It will work, in that it will charge you iPad normally, but will not Fast Charge it.

The iPad 5 does not support fast charging.

No. iPad5 does not support fast charging.

The maximum supported charge rate for iPad5 is 12W (i.e., 2.4A @5V).

All base priced model iPads, like the 5th-9th gen iPads DO NOT support the fast charging ( PD-Power Delivery ) feature.

Sorry.