Product Description :
This is a brand new Upgraded 4" Inline Duct Muffler for 4" high-velocity fans/blowers. With durable galvanized sheet construction and sound-absorbing foam lining, our duct muffler can reduce noise effectively and prevent your health from being hurt by noise. The specially designed open-cell foam in a convoluted pattern as an egg crate is good for superior sound absorption. It can stop the spread of sound waves and allow airflow get through the ducting, perfect for reducing noise from fans and carbon filter systems.
Features:
- Two 4" flanged ends.
- Portable and lightweight.
- 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 galvanized 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 your 4" ducting(not included) to connect with this muffler and your blower.
Specifications:
Flange: 4"
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 on Hearing of Different Decibel:
| Decibel |
Sense of Hearing |
| 0-20db |
Very quiet, hardly feel |
| 20-40db |
Quiet, like a 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 |
Package Contents:
- 1x Upgraded 4" Duct Muffler With Thick Sound Absorbing Foam
