• .
  • 0086-152-6787-7895
HVAC Diffuser Manufacturer

HVAC Diffuser, AC Grills Manufacturers

As a professional HVAC Diffuser Manufacturer, Biyang HVAC Diffuser covers all kinds of ventilation vents, such as Ceiling Air Diffuser, HVAC Grilles, HVAC Registers and Rain Louvers.  These HVAC Diffusers can be used for delivering the air conditioning and ventilation airs for all situations, and getting air flowing to the right direction and locations.

HVAC Diffuser is an important component of HVAC system and can work with many other accessories such as dampers, extractors and so on to ensure the smooth running of the whole HVAC system.  Biyang provides HVAC Diffusers for different usages and functions, such as the Supply Air Diffuser, Return Air Diffuser, Linear diffuser, Jet Nozzle Diffuser and so on.

Supply Air Diffuser normally works with damper or adjustable blades to maintain the right amount supply of air.  The Return Air Diffuser, Ductwork Diffuser, and Jet Nozzle Diffuser can be set with different accessories as well.  Biyang HVAC Diffuser varies in different shapes.  The most commonly used ones are Round Ceiling Diffuser (also named Circular Air Diffuser), Square Ceiling Diffuser, Linear Ceiling Diffuser and so on.

Based on different usages and setting environment, Biyang can provide different shapes to meet your demands.  For a specific project, we can custom the right HVAC Diffuser to fit into your designed place with your required air volume and air direction requirements.  Currently, for commercial buildings, more and more Biyang Linear Diffuser, Linear Bar Diffuser( also named Linear Slot Diffusers) are used, because such design of our product is easier and more elegant to fit into commercial decoration environments.

In addition, based on the different directions of air supplying, Biyang provides one way, two way, three way, four way air diffusers.  You can always get the right HVAC diffuser to satisfy your own needs. Biyang HVAC Diffuser can be made in different materials.  The most common one is the Aluminum Air Diffuser.  Biyang Aluminum Air Diffuser is widely bought and applied because various existing designs and competitive prices are available here.

Besides this, Biyang also provides Plastic Diffusers HVAC, Metal Ceiling Diffuser, Stainless Steel Ceiling Diffuser and so on.  To fit different usages and decoration colors and styles, you can choose different materials and surface treatments to get perfection combinations and decorations.  Plastic Diffusers of HVAC are normally made out of ABS.

ABS ones are consistent in physical and chemical features.  This makes them resistant and durable in the actual user, so Plastic Air Diffusers are easy to maintain and clean.  In addition, with light weight and overall structure, Plastic Diffusers are also easy to carry and set up.  Metal Ceiling Diffuser and Stainless Steel Ceiling Diffuser are the right product to choose if your project is in a tough and rigid environment.  These products ensure a long life expectancy and durable usage.

Of course, to custom the right HVAC Diffuser with the right material for your project is always our main concern.  If you have any requirement for your HVAC projects, you can always share with us about your problems to get the suggestions from us.  Biyang HVAC Diffusers do not only include the Ceiling Air Diffuser but also as the Floor Diffusers HVAC, Wall Louver, Door Louvers, Wardrobe Air Vents and so on.  These items are all used for air ventilation and flow.

Biyang can provide all sets of HVAC Diffusers to fulfill different items and usages in one HVAC projects.  Biyang’s one-stop solution always saves your time and energy. In addition, Biyang has the special oversea working team to help you expedite the HVAC setting up and installing.  We also help you to do the revisions of HVAC Diffuser if you come across issues in the actual set up.

Furthermore, we also provide different kinds of Ceiling Access Panels. Commonly, there are Ceiling Hatch, Ceiling Trap Door, Drywall Ceiling Panels, Fired Rated Ceiling Access Panel, Lockable Ceiling Access Panel, Plastic Ceiling Panel, Concealed Access Panel, Acoustic Access Panel and other styles customized according to customer requirements.

Please feel free to contact us to get the free suggestions and ideas for your HVAC projects.

How We Help Your Business & Projects

  • All kinds of ventilation vents in different shapes and materials for different usages and functions.
  • Special oversea working team to help you expedite the HVAC setting up and installing.
  • One stop solution of HVAC Diffusers to fulfill different items and usages in one HVAC projects.

HVAC Diffuser: The Ultimate FAQ Guide

What is HVAC Diffuser?

An HVAC diffuser is a device that is used to change the HVAC system’s fluid velocity and static pressure.

HVAC diffusers is an indispensable part of the air delivery and distributions in the whole HVAC system.

In all, there are grilles, registers, and diffusers.

What is VCD Diffuser?

Volume Control Damper Diffusers are oneswith damper at the back whose fuction is to control the air volume flowing through HVAC system.

How does an HVAC Diffuser Work?

HVAC diffuser consists of dampers, which reduce the velocity of air as it flows through.

As air flows through the HVAC diffuser, it slows down, thereby increasing the pressure within the diffuser.

This pressure then gets the air while mixing with the surrounding before flowing into the room.

You can control the dampers to regulate the amount of air flowing into the room.

This, in turn, has the effect of controlling the level of pressure and the amount of heat.

HVAC Diffuser

HVAC Diffuser

What is HVAC Air Balancing?

Air balancing is the act of testing and adjusting the airflow of your air conditioning system to achieve the desired air volume.

We use an air balancing hood to measure air volume in each grille, a manometer to measure the system pressure and a hygrometer to measure the humidity and temperature of your system.

What is the Difference between Grille, Register, and Diffuser in HVAC Systems?

A grille refers to a device whose function is to extract and supply air vertically without any deflection.

A register is a special type of grille that has moving parts.

Basically, they consist of grilles and dampers.

They usually are placed where there are air flow openings in your ventilation system.

There function is to control the volume and direction of air flowing into your room.

On the other hand, a diffuser is a device that helps in minimizing the speed while increasing the fluid’s static pressure as it flows along with the HVAC system.

The neck size and air flow size are normally different.

In addition, with diffuser, the air often makes a direction change from the ducting.

HVAC Diffuser vs. Register, How do they Compare?

You can easily adjust, open or close in between HVAC registers.

HVAC register consists of fins that help in channeling the flow of air towards a room while diffusers consist of dampers.

Diffusers help in controlling the volume of air flowing into a room while a register helps in controlling the direction of airflow.

What are HVAC Diffuser Types?

The most common types of HVAC diffusers are straight bladed diffusers, louver bladed diffusers, and linear slot diffusers.

Other types of HVAC diffusers include ceiling, egg crate, and perforated diffusers.

Do all HVAC Systems have Diffusers?


A diffuser is a critical component of an HVAC system which is a must-have for it to function correctly.

What is AC Diffuser Grill?

An AC diffuser grill refers to a device that helps in the vertical extraction and supply of air without any form of diversion.

They allow for airflow while inhibiting any unwanted particle from passing through the AC.

In some instances, AC diffuser grills have louvers which help in letting airflow in a particular direction.

How to Compare Linear Diffuser vs. Slot Diffuser?

The ideal installation location for a linear diffuser is a continuous wall to wall installation.

Slot diffuser is suitable for ceiling sidewall installation.

Linear diffuser

Linear diffuser

Slot diffusers are relatively expensive to install compared to linear diffusers.

Linear diffusers consist of louvers or grills on one side, which helps in maximization of airflow.

On the other hand, slot diffusers lack these grills or louvers and instead have plenum spaces which help in airflow.

How do you Calculate Supply Air Diffuser Sizing?

The following parameters determine the supply air diffuser sizing;

  • Cooling/heating area
  • Area dimension in terms of width and length.
  • Design of the space.
  • The ceiling height.

Calculating the sizing of the supply air diffuser involves:

  • Calculating the heat load of your building. If the building has several rooms, you need to calculate the heat loss in each room to come up with the buildings heat load.
  • Calculate your ductwork’s size and layout.
  • Select an appropriate supply air diffuser for your ductwork.

Why Does Pressure Increase in an HVAC Diffuser?

The pressure increase in an HVAC diffuser is due to the slowing down of air as it flows through the HVAC diffuser.

What is the Difference between a Nozzle and an HVAC Diffuser?

A nozzle is a device whose function is to increase fluid’s velocity while the pressure decreases.

The cross-sectional area of a nozzle varies.

Supply air diffuser

Supply air diffuser

 On the other hand, an HVAC diffuser function is to reduce fluid’s velocity as the pressure increases.

The purpose of this reduction in velocity is to enhance mixing with the surrounding fluid.

What is Common Swirl Diffuser Sizing?

Common swirl diffuser sizing is the process of finding the perfect swirl diffuser size for your HVAC system by checking through the reference chart.

Where Do You Install HVAC Diffusers?

You can install HVAC diffusers on the ceilings, the walls, or the floors.

HVAC System

 HVAC System

What Does Ceiling Diffuser Do?

The function of ceiling diffuser is to help in the even distribution of air throughout the room, which ensures proper ventilation.

What is the Material for Ceiling Diffuser Damper?

The commonly used materials for ceiling diffuser dampers are aluminum, stainless steel, and galvanized steel. Other materials are mild steel and plastic.

What Happens to Lost Kinetic Energy in a Diffuser?

The lost kinetic energy in a diffuser, which is as a result of the increase in pressure typically converts to internal energy within the diffuser.

This internal energy heats the air usually as it flows through the diffuser.

How do you Choose Diffuser for the HVAC System?

Consider the following factors when selecting a diffuser for HVAC system:

  • Air Flow (CFM / L/s)
  • Air throw
  • Noise criteria
  • Terminal velocity
  • Pressure drop
  • Mounting location
  • Material
  • Replacement cost

What is the Difference between Two-way Diffusers and four-way diffusers?

The difference between a two-way diffuser and four-way diffuser is in the number of directions that air flows.

A two-way diffuser is a two-way directional airflow while a four-way diffuser allows for a four-directional flow of air.

What is the Difference between Grill and Diffuser?

Grilles consist of straight openings while a diffuser comprises parallel angles plates that are moveable.

Grilles usually are at the duct system opening to offer airflow in a straight manner without any diversions.

On the other hand, you can install diffusers at given angles for directing air towards a particular direction in a room.

What is a Slot Diffuser?

Also known as a linear diffuser, it is a device whose function is to deliver air into a room with a slot or line shape design.

It is very easy and suitable to fit in a limited space area.

How does a Linear Diffuser Work?

A linear diffuser works by controlling the volume and pressure of air flowing into a room vertically ensuring air flows appropriately.

Linear diffuser

 Linear diffuser

What is the Purpose of Diffusers?

The primary purpose of an HVAC diffuser is to reduce the velocity of air flowing into the system while increasing its pressure.

However, it also helps in the even distribution of air along the different duct branches.

The diffuser also helps in noise reduction if you have installed the HVAC system appropriately.

What is the Difference between Egg Crate Diffuser and Jet Nozzle Diffuser?

The design of jet nozzle diffuser is in such a way that it allows for the long throw of air and can deliver air requirements for large spaces.

Jet nozzle diffuser

 Jet nozzle diffuser

On the other hand, egg crate diffusers are ideal for supplying air to small spaces.

Egg crate diffusers also tend to have short air throws.

Egg crate diffuser

Egg crate diffuser

Where Should you Use Jet Nozzle Diffuser?

Jet nozzle diffusers are ideal for large spaces that can handle large air volumes with long-throw requirements.

Jet nozzle diffuser

Jet nozzle diffuser

Why Use Supply Air Diffuser?

The supply air diffuser is critical in ensuring proper air ventilation within a room.

This happens by controlling the volume of air flowing into a room while increasing the pressure of this airflow.

Supply air diffuser

Supply air diffuser

How do you Calculate CFM for a Diffuser?

  • Use a pilot test tube assembly to calculate the velocity pressure within the diffuser. Let this velocity flow be in feet per minute. Join a pressure sensor to a pilot tube assembly.
  • To calculate the cross-sectional area, multiply the length by the breath or if it a square diffuser, get the square of the length.
  • Next, get the product of the cross-sectional area and the velocity flow rate.
  • The answer gives you the CFM of the diffuser.
  • For the cross-sectional area, if it is a circular diffuser

Where Should the Return Diffusers be Located?

The location for most return diffusers is at the return air ducts.

What is Return Air Diffuser?

Return air diffuser refers to a diffuser that is used to control the air volume and pressure flowing from the room to outside.

You can install it near the return air duct.

Does Every Room Require Return Air Diffuser?

Yes. Every room should have a return diffuser for efficient air circulation.

This is because different rooms may be having different air conditioning requirements.

Is there a Difference between Return Air Diffuser and Exhaust Air Diffuser?


Return air diffusers are used to control the volume and pressure of air flowing from the room.

Exhaust air diffuser function is to control the volume and air leaving the

What is Return Air Diffuser Symbol?

The symbol for return air diffuser symbol is.

Figure 10

How do you Choose Material for HVAC Diffuser System?

Check on the following factors

  • Environmental factors such as humidity and temperature. Your material should not be one that easily rusts on corrode.
  • The durability of the material. You need a material that will last long that gives you the required ventilation.
  • Insulation – An effective material for HVAC diffuser system should be insulated properly for it to function accordingly.
  • Flexibility – Useful material for a diffuser should be flexible yet strength to handle the changing pressure and volume of the HVAC diffuser system.

What Causes AC Vents to Sweat?

Humidity is the main contributing factor that causes AC vents to sweat.

Sweating happens when warm air that is moist comes into contact with the surface of the diffuser that is at a lower temperature.

This happens mostly when the temperature is lower than the dew point temperature.

What HVAC Diffuser Types Does Biyang Offer?

Biyang offers all types of diffusers including straight bladed diffusers, louver bladed diffusers, and linear slot diffusers.

Also, we customize diffusers depending on the needs of our customers.

Biyang Offer which Other HVAC Accessories?

Biyang offers all HVAC accessories such as Thermostat, Transistors, Wall/ceiling bracket, Duct reducer, and Insulated duct, among other accessories.

Does Biyang have Other Diffuser Shapes Apart from Round Designs?

Yes, various shapes of diffusers are available, including rectangular and square shapes.

We also customize the diffuser shapes depending on customer requirements.

Can Biyang Provide HVAC Diffuser Replacement?

Yes, Biyang offers diffuser replacement for your HVAC requirements.

All that is needed is the specifications of your diffuser for the fabrication of your HVAC diffuser

What is an Air Duct Diffuser?

An air duct diffuser refers to a device that controls the volume and pressure of air flowing into a

What are Common Materials for HVAC Diffusers?

The common materials for HVAC diffusers are aluminum, bronze, steel, stainless steel, or wood.

What is the Advantage of Stainless-steel Diffuser?

  • Stainless-steel is durable
  • Stainless-steel is not affected by humidity
  • Stainless-steel is scratch resistant
  • Ideal for people who are sensitive and allergic to base metals
  • Minimal maintenance cost
  • Stainless-steel offers an aesthetic appeal to your diffuser
  • Stainless-steel diffuser is heat and fire-resistant
  • It is easy to fabricate a stainless-steel diffuser

What is the Advantage of Wooden Air Diffuser?

  • Ideal thermal conductivity
  • Good to have a harmony decoration
  • Durable
  • Wooden air diffuser Is not easily affected by the environment. i.e., does not rust or corrode.

What is the Advantage of the Aluminum Diffuser?

  • They are generally lightweight which facilitates its installation process
  • They are flexible meaning you can use it in tricky places
  • Their durability ensures that you get the maximum usability of your duct diffuser
  • They are corrosive resistance, which gives them the versatility of use in different environments.
  • Aluminum diffusers are fire rated
  • Require little maintenance.

What are the Advantages of Plastic Grilles and Diffusers?

  • Weather resistance
  • It is relatively a cheaper option than other diffuser types
  • It offers leak-proof material for diffusers.
  • Plastic grilles and diffusers have a high thermal coefficient of expansion
  • Strong and much durable material
  • It Inhibits the growth of bacteria and molds.
  • Plastic grilles and diffusers are chemical resistant

What are the Standard Shapes for HVAC Diffuser?

The standard shapes available for HVAC diffusers are a circle, rectangle, and square shapes.

However, you can have a customized shape depending on your requirements.

What is the Advantage of Round Ceiling Diffuser?

Round ceiling diffusers offer an ideal ventilation system requirement since the diffuser can control air volume and pressure effectively.

What is a Wall Air Vent?

A wall air vent is a wall opening through which air flows into a particular room.

This air can either be hot or cold air depending on the room requirements.

How Does the Door Louver Work?

A door louver is designed to allow for the flow of air while restricting unwanted elements, including dirt, water, and debris.

What are the Materials for the Door Louvers?

Common materials for door louvers include metal, aluminum, wood, and fiberglass.

Scroll to Top
Scroll to Top