A single state is still a large market to pass up, and tooling costs make it impractical to manufacture different versions of things.

Even for software, the US experiences positive externalities of the GDPR and the rest of the US does from privacy laws in California and Illinois (likely others that I don’t know off the top of my head)

State laws also often serve as the prototype for federal ones.

It should be federal, but this is absolutely good news.

The reward for the work is the result of the work. For these communities to exists, there must be moderation and for many people the existence of said communities is worth the cost in time/server costs. Reddit selling stock off the backs of people who perform free labor for them is a problem, but someone who sets up a lemmy/mastodon/whatever to host discussion about the things that they care about is not a slave just because they don’t demand monetary compensation or sell your data. The lack of monetization isn’t a bug it’s a feature.

They’re pretty standard parts so don’t feel like you need to go with Fantech in particular, feel a little like I accidentally shilled for them a bit, just happened to be on their website (AFAIK they do make good stuff though). Glad that it helped and best of luck :)

The switch would be something like this. I think differential pressure between the inside of the duct and your kitchen would work.

and any “normally closed” damper would work. Wired up such that when your range hood is switched on, it also switches the motor in the damper on so that it opens.

The simplest thing would be a pressure or airflow sensor hard-wired to the switch for the hood itself.

Also consider instead of a 1 way valve installing a damper that only opens when your range good is turned on.