Is it possible to disable commetns site-wide?

Hi,

I'm using the classified plug-in and have comments turned off for all of the pages I have access to (or at least the ones I know I have access too!) however, the listings pages generated by the classified software displays the comments section. I would like to disable this too. I would like to disable comments so that they do not display at all. Is this possible? If so, how do I accomplish this?

Thank you!

Henry