The Zonefirst RTB14 is a heavy-duty 14-inch round take-off bypass damper engineered for precise static pressure relief in zoned HVAC systems. This barometric bypass damper features a built-in take-off collar, allowing for direct mounting to the supply plenum, which significantly reduces installation time and eliminates the need for additional transition fittings. Constructed from high-grade galvanized steel, the RTB14 utilizes an adjustable weighted arm to maintain optimal system pressure. As zone dampers close, the increased static pressure overcomes the weighted blade, bypassing excess air back to the return air plenum or a designated relief area. This mechanical operation ensures HVAC pressure regulation without the need for complex wiring or actuators. For the technician, this means a reliable, "set-it-and-forget-it" solution that prevents evaporator coil freeze-ups and reduces air noise at the registers. The counter-balanced blade is designed for smooth movement and can be fine-tuned in the field to meet the specific CFM requirements of the air handler. Streamlined Installation: The integrated 14-inch take-off collar allows for a fast, airtight connection directly to the plenum or duct trunk. Mechanical Reliability: Operates strictly on pressure differentials with no motor or electrical components to fail, ensuring long-term zone system airflow control. Field Adjustable: The threaded arm allows for precise positioning of weights to calibrate the opening point based on the system’s total external static pressure. Heavy-Gauge Construction: Built to withstand high-velocity airflow and maintain structural integrity in demanding residential or light commercial applications. System Protection: Effectively manages excess static pressure to protect the blower motor and heat exchanger while maintaining proper airflow across the indoor coil. Common Questions How do I calibrate the weights on the RTB14?Adjustment is performed by sliding the weights along the arm while the system is operating with its smallest zone calling. Use a manometer to ensure the bypass opens at the correct static pressure threshold to prevent high-limit trips or noisy air delivery. Can the RTB14 be installed in a vertical duct run?While barometric dampers are most accurate when installed horizontally to allow the weight to counter gravity predictably, they can function in vertical runs if the arm is oriented correctly. However, horizontal installation is the industry standard for maximum sensitivity. What size bypass should I use for a 5-ton system?A 14-inch bypass is typically rated for approximately 1000-1200 CFM. Depending on the minimum airflow requirements of your equipment, the RTB14 is generally suitable for 3 to 4-ton systems; always calculate the bypass requirements based on the difference between the total system CFM and the smallest zone's CFM. 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.
