Prelaunch Special

Soffit Vent System

The Pre-Launch Special starts on April 8, 2019, and ends at 12 AM EST – September 15, 2019. Save 53% off the retail price.

Deliveries are scheduled to begin on September 23, 2019.



The Moisture Flow Soffit Vent is the only soffit vent that effectively displaces a bath fan’s exhausted air outside of the soffit’s passive air stream, prohibiting the exhausted air from reentry into the attic.

$129 + S/H

Special Pricing $79.99 + Free Shipping                                                                         

*For bulk, commercial pricing requests, Click Here

Moisture Flow Manufacturing will donate $2.50 free of all administrative costs for every unit sold to the Stephen Siller  Tunnel to Towers Foundation. 


This video shows how The Soffit Vent System works with gravity rather than against it to create a proper venting flow.

Why Get This Soffit Vent System?

The Soffit Vent is Code Compliant under the International Code Council (ICC) and the International Residential Code (IRC).

The Soffit Vent is a down-venting system, which, unlike up-venting systems, works with the laws of physics rather than against them. It works with gravity to help bathroom fans discharge moist air, conserve energy, save money, and promote longevity of bathroom exhaust fans. Down-venting also helps prevent condensation in the bath fan’s transition duct by eliminating the stack effect.

Cuts down on moisture damage and mold growth caused by improperly venting bathroom exhaust fans in the attic.

Made with 100% THRIVE ®, an eco-friendly material produced by International Paper.

The attic is not part of the living space, is “out of sight out of mind,” with inspections few and far between.  Once the mold is visible on ceilings and walls beneath the attic, then the mold is already in an advanced stage of growth.

The vent rests underneath the eave, sitting flush with the gutter line, which will always partially protect it from the elements.

It is an industry first, giving builders and homeowners a safe and effective way to vent a bathroom exhaust fan through a soffit without running the risk of the exhausted air from circulating back into the attic.

The underlying causes of attic mold are; (1) The bath fan or bath fan transition duct vents directly into the attic, (2) venting directly into the soffit, (3) the deterioration of the common roof vent.

The Soffit Vent System is Perfect for:

National home builders seeking an alternative to venting bathroom exhaust fans through the roof or gable wall.

Retrofitting the existing 136 million homes and 5.6 million commercial buildings in the United States.

The 50 million do-it-yourself homeowners. Installation only requires small hand tools.

Soffit Vent System

The Moisture Flow Soffit Vent System is a preemptive measure that targets attic mold and moisture damage caused by improper venting of a bathroom exhaust fan.