A blower door is a powerful fan that mounts into the frame of an exterior door. The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then flows in through all unsealed cracks and openings. Wit calibrated blower door fans, we can now determine the infiltration rate with of the structure.
We can also, as the fan is running, move from room to room throughout the house to detect and diagnose air leaks.
Sometimes it’s possible to literally see or hear where air is coming into the house. We also use heatless smoke tools to pinpoint leak locations, as the smoke will be sucked out through the leakage point. Technicians may also use a special camera that’s super-sensitive to differences in temperature. Surface temperatures show up in contrasting colors, indicating a possible air leakage point.