Magnehelic Pressure

The Magnehelic Pressure Gauge solves the need for reliable, low‑cost monitoring of air or gas pressure — especially in HVAC systems, clean rooms, ventilation ducts, filter housings, blower systems, or ductwork. Instead of relying on complicated electronic sensors or liquid‑based manometers (which may leak, freeze, or require maintenance), this gauge delivers instant analog pressure readings using a robust diaphragm‑based mechanism. With its durable die‑cast aluminum case and acrylic cover, it resists shock, vibration, and environmental wear — making it suitable for industrial, commercial, or facility‑maintenance settings.

Because it supports both positive and negative (vacuum) or differential pressure measurement, the gauge works for checking filter loading (to know when to clean/replace), monitoring blower output, measuring duct static pressure, verifying clean‑room pressure differentials, or testing airflow and pressure drop across orifice plates or filters. The large 4‑inch dial is easy to read from a distance, enabling quick checks without needing to climb ladders or approach ducts. Dual pressure tap ports (high and low) allow flexible installation. As an analog device, no power or calibration is usually required — simplifying maintenance. Compared to digital sensors, it is typically more rugged, less costly, and doesn’t depend on batteries or calibration drift.