Shop Bypass Dampers

A common cause of blower motors in zoned HVAC systems failing prematurely is overheating, with high static pressure in ducts choking airflow and depriving the motor of its air-cooling source. Zoned systems rely on individual dampers to cut off air supply to areas that don't need it, thereby increasing static pressure.

Our selection of reliable bypass dampers you can order online resolves this by connecting the supply side of the system to the return side and automatically opening when the air pressure becomes too high, redirecting the excess air back into the unit.

Practical Applications for Bypass Dampers

Our selection of bypass dampers is applicable to a wide range of systems, including:

Residential Zoned Systems

Eliminate loud, whistling vents in bedrooms and living areas and maximize your comfort. Our smart bypass dampers for HVAC systems automatically learn and maintain the home's baseline static pressure with a single button push.

Commercial Office Buildings

Prevent long-term ductwork damage and blown seals in multi-office setups where individual zones frequently open and close throughout the day. Our Rectangular Bypass Dampers are an excellent choice for commercial office buildings, which almost exclusively use large, sheet-metal rectangular trunk lines rather than residential round flex-ducts. We carry exact-fit rectangular bypass dampers, such as the 20x10 or 20x12 sizes, that can be installed directly into the existing commercial plenum.

Variable Speed Integrations

Modern variable-speed electronically commutated blower motors (ECM) continuously adjust speed and airflow in response to system demand. You cannot use a basic, weighted mechanical damper with an ECM motor because the damper will constantly flap open and shut as the motor ramps up and down. Electronic bypass dampers monitor real-time pressure data, opening smoothly and precisely to relieve pressure without fighting the variable speed motor.

Single-Stage HVAC Retrofits

Standard, older single-stage air conditioners are either on or off, with no in-between. If you are retrofitting zone controls onto one of these older systems, you just need a reliable, budget-friendly mechanical release valve. The Constant Load By-Pass Damper (CLBD) uses a constant load and a magnetic latch. The contractor simply turns an adjustment knob to set the desired static pressure limit, and the damper mechanically handles the excess air volume, making it an economical, foolproof solution.

Secure Your Bypass Dampers Today

Maximize energy efficiency, quiet operation and extend the life of HVAC units. We offer an extensive inventory of trusted brands, including EWC Controls and iO HVAC Controls, available in both round and rectangular duct sizes. Browse our catalog to find the exact size and style required, and buy a bypass damper today.