Processing Time: 1-2 business days
Shipping Time: Expedited Express 2-5 business days
Product Code: LAS002003
Product Type: Air Purification
Limited-Time Offers, End in:

This is a brand new Upgraded Inline Duct Muffler with size optional 4"/ 6"/ 8" for 4"/ 6"/ 8" 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 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. Make your indoor gardening fan obviously quieter.


  • Two flange ends - Size Options for 4 in, 6 in, 8 in.
  • 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 galvanized sheet construction.
  • Wave crest polyurethane sponge can offer excellent sound and vibration absorption.
  • Moisture resistant - great for use in damp environment.
  • Extended collar and lip for easy duct hook-up.


  • Flange Optional: 4"/ 6"/ 8"
  • Fit for Fans/Blowers: 4"/ 6"/ 8" Flange
  • Surface Material: Durable Galvanized Sheet
  • Sound Absorbing Foam: 3-1/4 in Thick Wave Crest Polyurethane Sponge
  • Fusion Point of Foam: 250 degree centigrade
  • Overall Size
    • 4 in: 6-1/2" Diam. x 15-3/4" Long
    • 6 in: 9-1/2" Diam. x 21-1/2" Long
    • 8 in: 11" Diam. x 24" 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

    Package Includes:

    • 1x Upgraded Duct Muffler With Thick Sound Absorbing Foam
    • Free UPS standard shipping on all US orders (lower 48 States)
    • Orders before 12pm. PST will be shipped out in the same business day.
    • This item will be delivered in 2-5 business days for the lower 48 States.
    UPS USA delivery map
    • Additional Shipping Fees for Expedited Shipping and DHL Worldwide Service
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