does this get installed before the fane for after the Fan and how far?

I've installed one before and one after - directly on the fan. I ultimately returned the one before the fan because the improvement was relatively minor.

Can you connect these mufflers in series? And what impact does that have? e.g. one reduces 50% two reduces 75% ... and so forth?

I don’t think they can be used end to end but you can put one on either side of the fan and that should reduce the sound.... or if you’d like you can put one directly against the fan and then add another one at the end of a duct as well. I can’t give you any specific numbers though.

Can I simple insert this silencer (not fan) before my output in my home music studio?

The openings on each side is 4" in diameter. I'm not sure exactly what your affixing this to but if it's similar to any duct opening you'll need a clamp or coupler. Hope this helps!

Will this work on a radon fan system?

i dont know about a radon but ive used a hyperfan and it fits perfect. ive also used one of those cheap vivosun ones with the red fan blades and it is about a quarter inch smaller than the flange on th muffler. it does work well though.

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Inline Duct Fan Silencer 4", Noise Reduction Muffler

Product ID: 452115487

Details

Brand
AC Infinity
Configuration
Dual/Dual
Item Weight
1.04 kg
Material
Alloy Steel
Shape
Round

🔇50% noise reduction

🌬️4-inch duct opening for max airflow

🛡️corrosion-resistant galvanized steel

EC$1096

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Description

🔇 Silence your space, amplify your focus.

BUILT TO LAST - Durable galvanized steel body resists corrosion and extreme temps.
EFFORTLESS INSTALLATION - Compact 4-inch diameter and 15-inch length fits standard inline duct fans.
WHISPER QUIET PERFORMANCE - Cut fan noise by up to 50% with advanced neoprene foam tech.
VERSATILE VENTILATION SOLUTION - Perfect for grow tents, HVAC, bathroom fans, and AV cooling setups.
SEAMLESS FIT SOUND ABSORPTION - Dual aluminum flanges absorb vibrations for ultra-smooth airflow.

The AC Infinity Inline Duct Fan Silencer 4" is engineered to reduce fan noise by up to 50% using high-grade neoprene foam and dual aluminum flanges. Its corrosion-resistant galvanized steel body withstands extreme temperatures, making it ideal for grow tents, HVAC systems, and home ventilation. Designed for 4-inch duct openings, it ensures maximum airflow while creating a quieter, more comfortable environment.

Specifications

ASIN	B0829GJ5Q7
Best Sellers Rank	#1,934,381 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #2,068 in Exhaust Fans
Brand Name	AC Infinity
Configuration	Dual/Dual
Country of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (193)
Global Trade Identification Number	00819137021051
Item Highlight	Silencer for 4" Inline Duct Fans, Aluminum and Galvanized Steel Build, Indoor Hydroponics Grow Tent Ventilation Systems
Item Shape	Round
Item Weight	1.04 kg
Manufacturer	AC Infinity
Manufacturer Part Number	AC-DSA4
Material Type	Alloy Steel, Aluminium
Model	AC-DSA4
Number of Items	1
UPC	819137021051
Unit Count	1.0 Count

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