BAD NAICS CODES FOR SELF-FUNDED SEARCH

Does anyone have a list of NAICS codes which are highly unlikely to be suited for a self-funded search? I've run into a number of edge cases that I've been going back and forth on such as...
236210 Industrial Building Construction 236220 Commercial and Institutional Building Construction

My natural inclination is that they're not a fit but I know there are a few searchers who have bought businesses that might fit into these categories (such as roofing).

I figured I'd ask if anyone's already thought through this/if there's a list out there



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