Grills, Registers, and Diffusers (GRDS) Overview
- GRDS are essential components of an HVAC system, facilitating air movement between the ductwork and the conditioned space.
- They can be installed on the floor, wall, or ceiling, depending on the ductwork layout, space construction, and occupant comfort needs.
Design and Functionality
- GRDS are designed to supply a specific amount of air in the correct direction, angle, and height.
- The size and design of GRDS are based on the volume of air they need to move, measured in CFM (cubic feet per minute).
- Grills allow air to enter the return ductwork from the conditioned space.
- Filter grills, a common type of grill, have a hinged door for easy filter access and are made of painted steel or aluminum.
Registers and Diffusers
- Registers and diffusers enable air to exit the ductwork and enter the conditioned space, directing airflow to where occupants are.
- The velocity of air leaving the register is measured in FPM (feet per minute).
- A properly designed duct system ensures the air velocity at the register is appropriate to avoid noise issues like whistling.
Key Concepts
- Throw: The distance air travels from the register into the conditioned space, typically 6 feet in residential systems.
- Balancing: Adjusting the volume and velocity of air leaving the register using dampers in the ductwork to ensure supply and return air are as designed.
Residential vs. Commercial Systems
- Residential GRDS layouts are simpler, with living spaces usually 8 to 10 feet tall.
- Commercial GRDS layouts are more complex, varying based on the number of occupants, room dimensions, and other variables.
- Commercial GRDS are typically engineered and designed specifically for the space they serve, considering factors like airflow throw, velocity, and noise control.
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