Spigot Silencer The Elta Spigot Silencer is a compact circular duct attenuator with a spigot connection, designed to reduce duct borne noise on smaller ventilation systems. It is particularly useful where you need cross talk reduction between rooms, plus a simple connection into flexible ducting or spiral ducting. Select models available for next day delivery. Where it fits best Small fans and compact duct runs: a small metric range designed with space conscious installs in mind Cross talk control: helps reduce noise transfer through shared duct routes Flexible and spiral ducting: spigot ends make connection straightforward Construction Rigid galvanised sheet steel casing with a highly absorbent sound attenuating lining between the outer casing and an inner perforated steel lining. Instead of threaded fixing holes on the end faces, the silencer uses a steel spigot for easier mounting into ductwork. Kitchen extract option For kitchen extract applications, Melinex lined silencers must be used to prevent grease impregnation into the acoustic media, as prescribed in DW/172 HVAC Specification For Kitchen Ventilation Systems. Sizes and lengths Standard spigot diameters: Ø100 to Ø500 Lengths available: 300mm, 600mm, 900mm, 1200mm Larger sizes: for Ø560 to Ø710 please contact Elta Understanding silencer performance Silencer attenuation is stated as dynamic insertion loss. To estimate the sound level of a fan fitted with a silencer, subtract the dynamic insertion loss values from the fan sound power level spectrum (dBW) across the full octave band mid frequency range. Achieved attenuation varies with air velocity and flow pattern and noise regeneration can occur at higher velocities, especially in EP silencers. Selection tip Choose the spigot diameter to match the duct first, then select the length based on the level of attenuation required and the space available. For kitchen extract, specify the Melinex lined option. Where circular silencers cannot achieve the required attenuation in noise sensitive areas, splitter silencers can be designed as an alternative. Product Data, Performance & Dimension Sheet Dynamic insertion loss tables across octave bands, plus dimensional data, weights and product codes for the Spigot Silencer range. Includes spigot diameter coverage, available lengths and the Melinex lining note for kitchen extract applications. Click here to download the spigot silencer data sheet. Click here to download the full data, performance and dimension sheet. Looking to specify or purchase? Explore our full range of heat recovery ventilation units or contact Buy Ventilation for expert guidance on selecting the right system for your project.