80 Ill. Adm. Code 2900.25
Quorum
Section 2900.25 Â Quorum
Six members of the Board shall constitute a quorum if there
are 11 members then serving. If there are 10 or fewer members serving, 5 members
shall constitute a quorum. Â In order to conduct a regular or special meeting
via teleconference, 6 members must participate.