My neighbor has a Leneoux Pulse Furnace.
The homes are about 20 feet apart & when his furnace comes on I hear it as a humming sound in my room on that side of the house. It's a High Efficiency Furnace with the exhaust by coming out the side of his house. He says he has a muffler on exhaust & recently had it checked out by a technician but the loud humming noise continues when the furnace comes on in 8 - 10 minute cycles.
Is this a defect in the furnace. How can the noise be eliminated.