Due to fumes my renovation contractor diverted our forced air intake vent by temporarily covering the intake with a small duct attached to an even smaller tube.
It stayed like this for around 2 days. Is this a bad idea? The furnace sounds like it is straining. I asked him if the pipe needed to have a minimum diameter and he said it was fine like this.
I attached a photo. just looking for a second opinion especially since the furnace sounds louder since he added this. Even when I removed it, the furnace now sounds louder.