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Engineering Calculators

Diffuser Size Calculator

Instructions:

  1. Review the methodology to ensure it aligns with your project's requirements.

  2. Select US or Metric units

  3. Select the Diffuser or Grill Type, Return Grill, 1-Way Diffuser, 2-Way Diffuser, etc.

  4. Enter the velocity criteria, FPM [m/s]

  5. Enter the flow rate, CFM [l/s]

  6. The Results Table will populate with Diffusers that meet the specified criteria. 
    A link to a sample specification sheet is located above the table.

Click here to jump to the table of Noise Criterion (NC) based on the ASHRAE Handbook.

Manufacturer spec sheet
Throw velocity in FPM
Air flow in CFM
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Throw velocity as entered

FPMm/s Throw velocity as entered Throw velocity as entered, FPM Throw velocity as entered, m/s

Air flow as entered

m³/hrCFM Air flow as entered Air flow as entered, m³/hr Air flow as entered, CFM

Reads GrilleTech's published performance tables. Picking a diffuser type prints that type's whole table: neck sizes down the side, neck velocities across the top, and for each pairing the air flow it carries, the static pressure it costs, its noise criterion and, on the supply tables, the throw. Nothing is interpolated and nothing is chosen for you. You read the size off the table against the flow you need, which is why the page wants a wide screen.

The two entry boxes for each quantity are alternatives, not a pair. Under US units the FPM box is the one read; under Metric it is the m/s box, converted through the workbook's own eight-step ladder (1.5, 2, 2.5, 3, 3.6, 4.1, 4.6 and 5.1 m/s against 300 to 1000 FPM), which reports the nearest step at or below the entry and nothing at all below 1.5 m/s. Air flow converts the other way, m³/hr to CFM at 0.588577779, rounded to whole CFM.

The sidewall multi-shutter table is the one that is cut short. The workbook mirrors rows 2 to 57 of every catalogue sheet onto the page, which is the whole of the five curved-blade tables and the whole return table, but the sidewall sheet is 92 rows: 39 of its 56 neck sizes are printed and the larger ones, from 20 x 12 in. up, have to be taken from the manufacturer's own sheet. The published page is cut at the same place.

One published throw is corrected. 'CL1'!E17, the 12 x 6 in. one-way curved blade at 500 FPM, is stored as 45280, which is Excel's serial number for 20 December 2023, the range "12-20" typed into a cell Excel turned into a date. The same performance table appears again as the multi-shutter sheet, where the same cell reads "12-20", so the two types currently disagree about one grille. This page reports 12-20 for both.

The last line of every table is corrected too. The published build writes that one line out through the numeric conversion it keeps for its own comparisons, so the 48 x 24 in. curved blade throw of "14-23" ft prints as 14, the 48 x 30 in. return grille's noise criterion of "<20" prints as 0, and an empty cell prints as 0. Every other line is written unchanged. This page prints all of them unchanged.

One label is corrected. The return table's free-area label for the 24 x 18 in. grille reads "Ak 2.35" where the other twenty-five in that column read "Ak = <area>". This page reports "Ak = 2.35".

Nomenclature:

Ps-Static Pressure [in. wg]

NC-Noise Criterion

Throw-Throw estimates based on terminal velocities of 100 FPM and 50 FPM respectively [ft]

Adicot is not affiliated nor do we recommend any diffuser/grille manufacturers.  Any references or links to specific manufacturers are for illustrative purposes only. 

Methodology:

The Diffuser Size Calculator is a technical tool designed to assist engineers and HVAC professionals in calculating the appropriate size of diffusers for use in commercial and residential air distribution systems. The tool calculates the optimal diffuser size, taking into account factors such as air velocity, throw distance, static pressure, and air pattern dispersion. A properly sized diffuser is essential for ensuring that conditioned air is distributed evenly and efficiently throughout a building, which can help to improve indoor air quality and reduce energy costs. This tool can save time and effort for professionals who need to select and install the appropriate diffusers for their HVAC systems.

Diffusers can be sized based on Noise Criterion (click on the table below for ASHRAE Fundamentals-based recommendations based on room type), available static pressure, and/or throw. You can vary the FPM input to hone in on the correct diffuser size for your project. Below is a table of recommended noise criteria values based on Room Type.  The values are based on ASHRAE's Handbook, Chapter 49, Noise and Vibration Control, Table 1, https://www.ashrae.org/technical-resources/ashrae-handbook/ashrae-handbook-online.

Design Guidelines for HVAC-Related Background Sound in Rooms

Noise Criterion Values are based on ASHRAE Handbook Chapter 49, Noise and Vibration Control, Table 1
Room TypesNoise Criterion (NC)
Churches, mosques, synagogues25-35
Conference rooms25-30
Corridors and lobbies30-40
Courtrooms30-35
Hospitals and clinics25-35
Hotels/motels25-30
Indoor stadiums, gymnasiums45-50
Laboratories35-50
Libraries25-35
Office buildings25-30
Open-plan offices35-40
Performing arts spaces20-30
Residences, apartments, condominiums25-35
Schools25-40

This calculator is best used on a Computer or Tablet.

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