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Jump Duct (aka Transfer Grill)

In the construction industry, a “jump duct,” also known as a “transfer grill,” refers to an air passage used to balance the airflow between two adjacent spaces with a shared HVAC system. It is a duct or a grill placed between two rooms, usually a room and a hallway, to provide air circulation and pressure balancing. Jump ducts help maintain proper air pressure in each room, ensuring efficient heating, ventilation, and air conditioning (HVAC) system performance. They play a crucial role in improving comfort levels, reducing energy consumption, and preventing issues such as uneven temperature distribution and pressure imbalances within a building.


The primary function of a jump duct is to facilitate the movement of air between two spaces, ensuring proper air circulation and pressure balancing. By allowing air to flow freely between connected rooms, jump ducts help equalize pressure differentials, which can occur due to closed doors or inadequate ventilation. This process ensures that each room receives an adequate supply of conditioned air, maintaining a comfortable and consistent indoor environment throughout the building.


Jump ducts are typically installed in the ceiling, floor, or wall between the connected spaces, depending on the building’s design and layout. The size and placement of the jump duct are determined based on factors such as the volume of air required, the size of the rooms, and the location of the HVAC system. Proper installation is essential to ensure efficient airflow and optimal performance of the HVAC system.

Benefits of Jump Ducts

There are several benefits to incorporating jump ducts into a building’s HVAC system:

  • Improved Comfort: Jump ducts help maintain consistent temperatures and reduce drafts by ensuring proper air circulation between connected spaces.
  • Energy Efficiency: By balancing airflow and pressure, jump ducts reduce the workload on the HVAC system, leading to lower energy consumption and operating costs.
  • Prevention of Pressure Imbalances: Jump ducts prevent pressure imbalances that can cause doors to slam shut, affect indoor air quality, and lead to discomfort for occupants.
  • Flexibility: Jump ducts provide a cost-effective solution for improving HVAC system performance in buildings with multiple rooms and varying air circulation requirements.


Jump ducts, also known as transfer grills, are essential components of HVAC systems in residential and commercial buildings. By facilitating airflow between connected spaces, jump ducts help maintain comfort, improve energy efficiency, and prevent pressure imbalances. Proper design and installation of jump ducts are essential to ensure the optimal performance of the HVAC system and the overall comfort of building occupants.

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