Love the 3 part series. I would only recommend adding the links to the other videos on the description, for each video, so it's easy to navigate between the three.

Volume and surface areas can be so time consuming with blower door Testing, there is no doubt. Good video guys.

Best blower door video by far!

really cool so you can do a whole house not just duct/vents as well as you can do building floors of large commercial buildings. Thought at first it only was usable for vents/duct but its really general.

Isn't it easier to take the exterior dimensions of the house and then check the interior for any spaces with different heights?

Good video. I can recommend a laser tape for easier measurements.

OMG, your are the BEST!

Attention to Fireplaces, Combustion Heaters and Dust is a good Point but its more safe to run the Test with Overpressure by turning the Fan. Also test in Both directions could make sense if some parts like Plastic-Foil-Connection work as a Valve in one Direction ...Actual I use Blower Doors as the cheapest Ventilation-system to move huge Amounts of Air during Corona-pandemic: I calculate >30 Airchanges per hour while people in closed rooms get infected during 2 Minutes.