The Field Controls 01986501, also known as the Model 8" MG1, is a precision-engineered 8-inch double-acting barometric draft control designed specifically for gas-fired appliances. This draft regulator maintains a consistent natural draft by automatically compensating for changes in atmospheric pressure and chimney temperature. Rated for high-efficiency performance, it features an adjustable setting range from .01" to .1" water column (wc), ensuring the vent pipe pressure stays within manufacturer specifications. The double-acting gate design is critical for gas applications as it allows for the relief of momentary backdrafts or positive pressures, protecting the burner flame and preventing pilot outages. Using a heavy-duty stainless steel knife-edge bearing, the gate provides friction-free movement for sensitive draft stabilization. For technicians installing commercial or residential gas heaters, this control is the industry standard for optimizing combustion efficiency while reducing soot buildup and heat loss through the flue. Precision Draft Regulation: Accurately maintains steady draft pressure between .01" and .1" wc for optimal gas burner performance. Double-Acting Safety: Features a gate that swings both ways to relieve internal positive pressure and external downdrafts. Industrial Durability: Constructed with a robust 8-inch collar and a gate assembly designed to withstand high flue gas temperatures without warping. Ease of Calibration: Integrated weight system allows for fine-tuning the barometric damper to the specific static pressure requirements of the appliance. Versatile Application: Ideal for gas-fired furnaces, boilers, and water heaters requiring tight venting system control. Common Technical Questions When should an 8" MG1 be used instead of a single-acting control? The Field Controls 8" MG1 is mandatory for gas applications where positive pressure relief is required. Unlike single-acting controls used for oil, this double-acting unit allows the gate to open outward to vent momentary backdrafts safely. How do you adjust the draft setting on this control? Adjustment is managed by moving the counterweight on the gate. For professional HVAC troubleshooting, use a manometer to measure the draft in the stack and lock the weight once the desired inches of water column setting is achieved. Can this be installed in any orientation? The control must be installed in a vertical, horizontal, or inclined flue pipe, but the gate itself must be level. Proper draft control installation ensures the knife-edge bearings function correctly for sensitive response. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
