I have a project that don't use any HVAC system. It's all natural ventilation. Is it ok to left the HAVC protection out since there is nothing to protect. Can the project apply for this credit?
You can still apply for the credit.
However, you still need to create an IAQ Management Plan for the project. Also you will also need to ensure "absorptive materials (installed or stored on-site) were protected from moisture damage during the construction and preoccupancy phases."
Then select the option "Permanently installed air handling units WERE NOT operated during construction" on the form.