Airpro Industries India

18 x 18 Inch Square HVAC Diffuser
Fundamentally, in a return air diffuser, the air flows back into the ductwork system. In exhaust air diffuser, the air flows out of the ductwork system. Vent size – On many occasions, you'll realize the size of the vent in return air diffusers tends to be relatively larger than those in the exhaust air diffuser.

Round diffusers are generally installed on ceiling tiles or exposed ductwork using round ducts for supply and return air HVAC applications. Round diffusers are available with black powder coated butterfly damper for supply air applications.

To find square diffuser specifications, search online for PDF technical documents from manufacturers like Airpro, which detail nominal sizes, airflow rates, pressure drops, sound levels, construction materials, and available accessories like dampers and plenum boxes. These PDFs typically provide performance data, installation instructions, and product selection tools for different airflow patterns (1-way, 2-way, 3-way, 4-way).
Where to find PDF specifications
Manufacturer Websites: Visit the official websites of HVAC product manufacturers such as TROX, Airmaster, Airpro,Titus HVAC, and Falcon Al Ahliya. Look for a "Downloads," "Products," or "Technical Data" section to find product-specific PDFs.
HVAC Supply Portals: Websites that specialize in HVAC products or offer technical documents for various brands, such as Scribd, often host specification sheets.
What information to expect in the PDF
Dimensions: Nominal sizes of the diffuser face, such as 250x250mm, 300x300mm, or larger.
Airflow Performance: Ranges for volume flow rate (e.g., 20–665 l/s) and corresponding pressure drops (e.g., Pa).
Sound Data: Sound power levels (LWA) in dB(A) for various airflow conditions.
Performance Characteristics: Air throw distances in meters and terminal velocities in m/s.
Material and Construction: Details on materials used, such as extruded aluminum profiles, and features like removable cores.
Accessories and Options: Information on optional items like dampers (cord-operated, opposed blade), plenum boxes with different connection types (spigots), blanking plates, and different RAL finishes.
Installation: Mounting instructions, especially for different ceiling systems.
Air Discharge Patterns: Information on different core patterns (1-way, 2-way, 3-way, 4-way) and their corresponding applications.