What Is a Depressurization Duct?

(And Why Your Home Needs One)

By Laura Titensor, Customer Relations Manager

https://www.youtube.com/watch?v=DrlVv2ywthQ

This short video makes it clear why you need depressurization ducts.

Did you know your home could be pulling in 20% dirty, unfiltered air—even with a high-performance filter installed? That’s where a depressurization duct comes in.

In this episode of You Ask, We Answer, our team explains:

• What a depressurization duct is and how it works

• Why homes are always under negative pressure

• How infiltration dilutes your clean air with dirty air (by up to 20%)

• How tying outside air directly into your return system ensures it’s filtered before entering your home

• The difference between infiltration vs exfiltration—and why only weatherization can stop exfiltration

• How depressurization ducts make filters like MERV 16 or NovusAer perform at their full rated efficiency

Whether you’re a homeowner or an HVAC professional, this short video makes it clear why depressurization ducts are a game-changer for indoor air quality.