2.4 BH20 with Reflector output question

I’m trying to squash down the output on a 2.4 BH20 unit with a reflector to 4Watts EIRP.

What gain does the reflector add? is it an overall 22dBi?

If so; If I was to set my transmitter output power to 14dBm, would I expect to be putting out approx 4Watts EIRP?

Cheers.

on the 2.4 the reflector adds 11 db gain so i would try 17 instead of 14