The IEQc4.6 credit language seems to anticipate your question, stating that "acoustical ceiling systems and wall coverings" must comply. What you describe seem to be "acoustical ceiling systems." What do you think—is this not an accurate or fair description?
Yes, Tristan, I believe you are correct. Just wanted to confirm, since there is a limited availability of these products on the market. Our design team is currently researching the Certainteed Ecophon Hygiene Baffles (which appear to meet the requirements for EQc4.6), to see if they can be purchased in the dimensions that are needed for our project.