Yes, but we use afb free version, so I asked it before the buy.
There is no firewall in the avast free version. I would also think that would be the case for the free avast for business version. I don't use the AFB version so I can't speak from personal experience.
If it is displayed in the avastUI > Tools sections and isn't showing a no entry sign (not installed) then you would appear to have a bug that some have reported in the avast free version, e.g. having paid options listed in the free version.
EDIT: Hopefully Eddy can get back to the topic as I believe he uses the avast for business version.