Sound Transmission Sheet Metal Duct Lined

In practice lined ducts and silencers are tested in a laboratory by substituting the test specimen for an unlined sheet metal duct having the same face dimension.

Sound transmission sheet metal duct lined.

L p l n tl 10 log a f 4 a d 1. L p sound pressure in room db. Sound transmissions through flanking paths noise and sound transmitted through duct walls through floors or through ceilings. Quiet liner hvac acoustic insulation also reduces heat gain or loss.

In over 50 years of serving the mechanical system marketplace mcgill airflow. Linatex textile fiber duct liner is a flexible duct liner specifically designed for lining sheet metal ducts in hvac systems this product meets the needs of one segment of the market that prefers a textile fiber duct liner. For example furnace duct noise reduction may require additional insulation in the ductwork to prevent popping from the metal expanding when you turn on the heat. L n sound power level in the duct db.

Architects designers and mechanical engineers who specify hvac systems want to optimize thermal efficiency while dampening unwanted noise to make structures as comfortable as possible for their occupants. If you have an older unit that sends buzzing sounds through your ducts you may get some relief from soundproofing ductwork until you can replace the hvac unit. Fiberglass duct liner insulation helps manage heat transfer and unwanted sound. 10 2 double wall insulated and single wall lined duct noise control 10 2 10 2 1 attenuation of insulated duct systems.

F cross section area of duct m 2. The data take on a haystack shape that shifts slightly with flow velocity. Acoustics room acoustics and acoustic properties decibel a b and c noise rating nr curves sound transmission sound pressure sound intensity and sound attenuation. Example sound attenuation in lined duct.

Sound attenuation in unlined duct. Sound or noise transmitted from the inside of a duct to the surrounding room can be expressed as. Sound attenuation of lined sheet metal ducts sound attenuation in rectangular straight lined sheet metal ducts. Figure 14 3 shows measured losses for a lined rectangular duct.

Sound transmission through duct walls estimating sound transmission from ducts to surrounding rooms. A d surface area of duct m 2. Noise and attenuation noise is usually defined as unwanted sound noise noise generation silencers and attenuation in hvac systems. The sound attenuation in 10 m duct can be calculated as 10 m 2 5 db m 25 db.

At low frequencies the. Producer of sheet metal duct and fitting components for air handling systems. Attenuation of sound in unlined sheet metal ducts. Quiet natural fiber acoustic duct liner contains no harmful irritants and is safe to handle and install.

It provides acoustical and thermal performance for lined metal ducts. A room absorption m 2 sabine.