1.Need to know if a shut off switch is required for a furnace age 2001?
2. how close to the unit it is required to be?
3. what year did this start to be recommended or required?
there is not one on the door assy. or outside of the unit.
4. And are main supply HVAC ducts still insulated on the inside of a metal duct where it meets the furnace.
thanks everyone you are always a great source of information.