HVAC diffuser is a type of vent cover that is installed over vent openings in the ceiling. It’s role is to supply conditioned air into the space. After the air is processed through the heating and cooling system, it is funneled through the ductwork until it reaches the ceiling diffuser.

Air balancing is a term commonly used in HVAC system operations. Experts consider it important for better performance of HVAC that the air in the room should be balanced and reach each tiny spot of the area. The major aim of an HVAC diffuser is to fulfill this very term and regulate the air thoroughly.

What is the difference between air diffuser and grille? The air diffuser is created in a way that it releases air in all directions. It’s the vents usually in round shape to cover all 360° angles. They are best if you want to distribute air evenly in the whole room.Some diffusers come in the shape that gives users the ability to release air in only one direction.

The air grilles have fixed and movable blades,its blades can only throw air in the same direction, you may adjust it towards up or down with dampers but not 360°.With a damper, return airflow can be better tuned and balanced.The air grilles are used to cover the supply air outlet and the return air outlet of the HVAC system.

How to measure the dimension of hvac diffuser?Before we measure hvac diffuser dimension, there are two things we need to know is physical dimension and neck size.Physical dimension is the length, width and height of a supply air diffuser. Meanwhile, neck size is the size of the connection between the supply air diffuser and the associated duct.

When sizing a grille or a register, you will measure the opening that the grille or register is designed to cover or recess into, not the total external frame size of the grille or register. So to measure the dimension of hvac diffuser is to measure the length, width and height.

Start by measuring the hole in the vent — do not measure the actual diffuser you're replacing as they overlap in the front and are always larger than the vent. In summary, you should first measure the width of the diffuser, followed by the height.

There are many different shapes of HVAC diffuser. They have square,rectangular, round, ball, swirl, perforated, bar and slot type. For high ceiling ventilation usually use square diffuser, round diffuser, jet nozzle diffuser, swirl diffuser and slot diffuser. For wall or duct ventilation often use double deflection, single deflection grilles, bar grilles, return air grille, egg crate grille and son on. And floor grilles have specially-shaped openings to promote the flow of air. You can choose the right diffuser according to the size and function, style, and location you need for your buildings.

To use an HVAC diffuser is one of the best ways to increase the airflow in your hvac system because it will circulate the air better.