The Script has list of adjustable filters:
$Direction – Direction of firewall rule: Inbound or Outbound;
$Action – Action rule performs: Allow or Block;
$Enabled – Status of a rule: Enabled – True or False;
$RuleGroup – Group rule has been assigned. By default script uses “$Null” variable, which filters all rules without assigned group. However you can specify a group a name if necessary;
$DisplayName – Name of a rule. By default I use an expression “*SQL*” to search for rules which have word “SQL” in their name. To retrieve all rules us “*”. To retrieve any particular rule use rule name.
He looks at viewing rules as well as creating, modifying, and deleting them.