Profile: Retrotec is a manufacturer of blower doors and door fan test equipment. We offer blower door systems, fans, gauges and accessories. Our blower door systems include Q46, Q4E, Q56 & Q5E automated blower door, QMG blower door and small-X-panel. Our Q56 consists of a 2 channel DM-2A digital gauge with automatic control, umbilical connection cord, a 2200 automatic fan with low flow plates and a rapid set-up hard door panel in a case. Our DM-2A measures and controls pressure & air-flow automatically. We offer 2200 & 3300 calibrated fans, DM-2 series 2 channel digital pressure gauge and accessories such as air current testers, grill mask, low flow fan field calibration plate & modular hard panel systems.