Description
The Dwyer 1221-12-W/M Flex Tube U-Tube Manometer is a reliable, straightforward instrument designed for measuring low differential pressures in HVAC, combustion, and ventilation applications. With a total range of 12″ w.c. (6-0-6″ w.c. bi-directional), this manometer delivers accurate, easy-to-read results in the field or mechanical room.
The flexible tube construction simplifies setup and positioning, while mercury fill (9.5 ounces Hg required) ensures stable, consistent fluid column readings. Whether you’re verifying gas pressure, checking filter differential, or commissioning air systems, the 1221-12-W/M provides the dependable performance HVAC professionals expect from Dwyer Instruments.
Key Features
- Bi-directional measurement range: 6-0-6″ w.c. (12″ w.c. total span)
- Flexible tube design for easy positioning and setup
- Mercury fill — 9.5 ounces Hg required to fill
- Classic U-tube manometer configuration for direct differential pressure reading
- Ideal for HVAC, combustion, and air system pressure verification
- Durable construction built for repeated field use
Specifications
- Model: 1221-12-W/M
- Brand: Dwyer Instruments
- Measurement Range: 6-0-6″ w.c. (12″ w.c. total)
- Fill Medium: Mercury (Hg)
- Fill Quantity Required: 9.5 ounces Hg
- Tube Style: Flexible / Flex Tube
- Instrument Type: U-Tube Manometer
Applications
- Gas appliance and burner pressure verification
- Air filter differential pressure measurement
- HVAC duct static pressure testing
- Ventilation and exhaust system commissioning
- Combustion air and draft measurement
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