I could hear a sucking noise coming from the ductwork.
There was legitimately little heat coming out of the air vents, and I knew it was because of the lack of airflow.
I knew little about heating and air conditioning, despite the fact that I knew what happened when there was no airflow, either the air filters were plugged, or the ductwork was plugged. Either way, it puts a lot of strain on the boiler, and it could cause the heat exchanger to crack and emit deadly gasses. When my fiance bought a gas boiler, I wanted to do some research. I had always had electric heat, or oil heat. I wasn’t familiar with gas heat. I knew that carbon monoxide and formaldehyde could be caused by many things, however the gas boiler was infamous for it when the heat exchanger cracked. It meant you needed a modern boiler or risked death in your home. I called the heating and air conditioning supplier and told them my associate and I had an airflow problem. I checked the air filter, and changed it, despite the fact that I still had no airflow. I was afraid there was a blockage in the ductwork. The heating and air conditioning company showed up the following day and confirmed my suspicions. He ordered a ductwork cleaning crew to come out the next afternoon, and then he checked the boiler. He said everything looked good, although he wanted to check the boiler again, once the ductwork was washed and the air flow was restored. He seemed certain there was no detriment to the heat exchanger, although he wanted to be sure there was nothing else affected by the lack of airflow.