Furnace Fan Noise Reduction

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Furnace fan noise reduction.

There are many ways of reducing noise through the duct work but the easiest and most effective method without restricting airflow is installing an in line noise muffler. Fiberglass duct liner absorbs noise and contributes to indoor comfort by lowering heat loss or gain through duct walls. The sponge also offers a cleaning effect to your furnace. A properly functioning furnace shouldn t make too much noise especially after initially starting.

The in line noise muffler will not only reduce the noise from the fan but noise from other rooms that travels through the ducts. Or if you have the space for it build some baffles out of 2x4 acoustic ceiling tiles inside the return chamber like below. Use a wire mesh to make the sheet. Furnaces generally aren t noisy and most modern furnaces are designed for noise reduction.

This had a noticeable sound reduction effect since it cuts the noise right where it originates. One that is generally needs repairs and the type of sound you re hearing can help determine the exact issue with the system. Make sure that your furnace filter is clean and isn t restricting airflow by being dirty. I used to measure in the furnace room at a distance of 1m from the blower door 62dba and after installingthis foam it went down to 58dba.

For effectiveness use the foam next to the blower intake. While the motor and fan inside your furnace makes considerable noise you don t exactly want it to sound as if you re standing next to a train when you go up next to it. Fiberglass duct liner is designed to be installed inside sheet metal ductwork and plenums. Follow the following procedure when building sound insulation for the furnace.

Sound damping melamine installed right besides the blower in the furnace.