u/FanBladeFleshlight

I'm an electrician and tried posting this in the Electricians sub but the mods there are, well, mods.

Have a house with a basement. It's split in two and meets the legal definition of two unfinished "rooms", neither qualify as a bedroom in my state (OR) since there's no closet.

One half has the electrical panel, electric water heater, and gas furnace. The other half only has a wood fireplace that is decommissioned and can't / won't be used.

What is best practice and/or code for placement of Smoke, CO, or Combo alarms in these two sections? Especially concerning distance in relation to the gas furnace. Both would be hardwired with the units I have on the main floor, so if one down there goes off, I'd know.