With Avast free, which free firewall?

Avast Free Antivirus / Premium Security
1

With Windows 8.1 & Avast free & Chrome,

Which is the best firewall compatible & free?

Windows firewall or NxFilter 1.7.5 (the most recent firewall if I am correct)

Many thanks

2

Best is a hardware firewall, but if you want a software firewall (as well), I suggest Comodo.

3

The firewall must be compatible with Windows 8.1 & Avast free

Usually Comodo is not compatible with windows, check microsoft compatibility site.

I need a firewall Avast specialist or other specialist know is compatible and performant.

4

you already have a firewall in Win8

http://www.howtogeek.com/172349/why-you-dont-need-an-outbound-firewall-on-your-laptop-or-desktop-pc/
http://www.howtogeek.com/122065/htg-explains-i-have-a-router-do-i-need-a-firewall/

5

Comodo is compatible with both avast and windows 8(.1)

btw,
Combination of “Performance” and “Conformant”. Commonly used by Microsofties but not a real word.

6

http://personal-firewall-software-review.toptenreviews.com/why-you-need-a-firewall.html
http://www.techsupportalert.com/best-free-firewall.htm
http://www.techsupportalert.com/content/hips-explained.htm

http://www.softpedia.com/get/Security/Firewall/Online-Armor-Free.shtml
http://www.softpedia.com/get/Security/Firewall/Privatefirewall.shtml

http://www.filehippo.com/download_comodo/13662/
http://www.knightwithapc.com/2011/11/download-comodo-firewall/