Can I max out the MAQs for each of my hazardous material classes in a single control area and still not have to do an H occupancy?

Yes, we can absolutely max out the Maximum Allowable Quantities (MAQs) for multiple different hazard classes within a single control area and still avoid triggering a Group H (Hazardous) occupancy. However, there is also a major caveat regarding how those materials are categorized and whether they pose overlapping physical or health hazards.

Here is how the International Fire Code (IFC) handles this.