This is a brand new Upgraded 4" Inline Duct Muffler for 4" high-velocity fans/blowers. With durable galvanised sheet construction and sound absorbing foam lining, our duct muffler can reduce noise effectively and prevent your health from being hurt by noise. The special designed open cell foam in a convoluted pattern as egg crate is good for superior sound absorption. It can stop the spread of sound wave and allow air flow get through the ducting, perfect for reducing noise from fans and carbon filter systems.
- Two 4" flanged ends.
- Portable and light weight.
- Safe and effective operation.
- Easy to install and maintenance free.
- The thickness of sound absorbing foam has been upgraded to 3-1/4"
(that is more effective than 1-1/2" or 2" in the market)
- High-quality corrosion resistant galvanised sheet construction.
- Wave crest polyurethane sponge can offer excellent sound and vibration absorption.
- Moisture resistant - great for use in a damp environment.
- Extended collar and lip for easy duct hook-up.
- Suggest using with your 4" ducting(not included) to connect with this muffler and your blower.
|Fit for Fans/Blowers||4" Flange|
|Surface Material||Durable Galvanized Sheet|
|Sound Absorbing Foam||3-1/4" Thick Wave Crest Polyurethane Sponge|
|Fusion Point of Foam||250 degree centigrade|
|Overall Size||6-1/2" Diam. x 15-3/4" Long|
The Influence to Hearing of Different Decibel:
|Decibel||Sense of Hearing|
|0-20db||Very quiet, hardly feel|
|20-40db||Quiet, like soft voice|
|40-60db||General, like common talk indoor|
|60-70db||Noisy, bad for nerve|
|70-90db||Very noisy, nerve cells are damaged|
|90-100db||Noisy intensify, hearing is damaged|
- 1x Upgraded 4" Duct Muffler With Thick Sound Absorbing Foam