Replace the fourth bulleted item with the following text:If the classroom has a volume of over 13,500 cubic feet, acoustical panelson both ceiling and walls may be needed to achieve appropriatereverberation time. For this reason, project teams with room volumesbetween 13,500 cubic feet and 20,000 cubic feet are strongly encouragedto use the methods described in ANSI Standard S12.60-2002 to confirmthat the room design meets the intent of the prerequisite. The option toconfirm compliance by showing an NRC of .7 or higher for 100% of theceiling area (or equivalent) is still available for rooms of this size, but itdoes not guarantee appropriate reverberation times. Note that carpet addslittle to reverberation control, although it is useful for controlling self-noise(chair movement, footfalls, etc), especially in lower grade levels.