I've been in rental homes where the microwave vents into the house and wondered what was going on - this explains it - and hard to believe there isn't a federal building standard that a range hood needs to vent outside to bring in cleaner replacement air
Ventilation Isn’t Enough To Make Gas Stoves Safe
I've been in rental homes where the microwave vents into the house and wondered what was going on - this explains it - and hard to believe there isn't a federal building standard that a range hood needs to vent outside to bring in cleaner replacement air