Committees can set their own rules for behaviour at their meetings, provided they don’t contravene strata (or any other law).
For instance, committees can’t decide that they want members who have declared a conflict of interest to sit in on discussions about the conflicting issues. The law says they must leave the meeting. The same goes for members who are unfinancial – the committee can’t decide it’s ok for them to vote, because the law says they can’t.
On the other hand, the committee can adopt a code of conduct and standing orders, or have one imposed on them by a general meeting, that moderate they way they behave during meetings. Have a look at this old post, for more on that.