The Most Popular
Blower Door.

Our best seller, outselling every other make and model. DM32X gauge, six flow ranges and the wind-dampening SmartCloth, all included.

Explore the 5100

Every Duct,
Tested.

The Model 300 for homes and the Model 400 for large buildings: lightweight, high-pressure duct testers run by the DM32X.

Explore DucTesters

Trade In.
Upgrade to DM32X.

Put your current gauge toward a new DM32X.

Explore Trade-In Options

See the
Invisible.

Discover hidden air leaks in minutes with the AirTracer smoke generator.

Explore AirTracer

30% Lighter.
More Power.

The Model 7000 fan weighs 23 lb and moves more air than any other blower door on the market. Run it from the 120V/240V drive or a 48V DC battery.

Explore the 7100

The World Leader In Airtightness Solutions

Online Training Courses

Hands-On Support

Innovative & Intuitive

Building science,
out loud.

The Flow Lab Podcast: Ben Walker and Sam Meyers with the people shaping airtightness, ducts, codes and the trades.

Listen to The Flow Lab