Tech Tools

OUR TOOLS ALLOW YOU TO EVALUATE MANY CALCULATIONS:
  • Convert Volume Flow Rate
  • Convert Duct Types to round, oval, or rectangular
  • Perform pressure, stiffener spacing, and gauge calculations
  • Calculate Thermal Data
  • Rectangular Silencer Selector
  • Round Silencer Selector
HOW TO USE:
Click the tab at the top of the page for the calcualtion you would like to run. After entering all the required information, click the appropriate button to see the results.
RESULTS:
The results are shown at the bottom of the page and are rounded to various digits.

Convert Volume Flow Rate

This web tool converts the entered value to cubic feet per minute (cfm) or to liters per second (L/s) depending on your selection after entering a value.
Must be greater than zero.
Results:
0
cmf

Convert Duct Types

This web tool converts duct to rectangular or equivalent round. After entering all the needed data, click the Calculate button.
Diameter must be greater than zero.
Minor must be greater than zero.
Results:
Rectangular Major: 0 inches
Oval Major: 0 inches

Calculate Thermal Data

This web tool makes thermal calculations for single and double-wall, round duct. Calculations are based on equations and methodology given in Engineering Report Volume 2, Number 11, as published by United McGill in 1990. Note that results may differ from the Engineering Report due to rounding error.Though the specific heat of air, Cp, is also a function of temperature, it is held constant at 0.24 BTU/lbm/°F which is adequate for temperatures up to 500°F.
Diameter must be greater than zero.
Flow rate must be greater than zero.
Inside duct temperature must be greater than zero.
Ambient temperature must be greater than zero.
Duct length must be greater than zero.
Results:
Estimated Heat Transfer:
Estimated Skin Temp:
Estimated Exit Temp:
Ambient Dew Point Temp:
Condensation Likelihood:
Thermal Conductivity:
In-duct Air Density:
0 BTU/hour
0 °F
0 °F
0 °F

0 k
0 lb/ft2
Ins. Wind Dia Flow InTmp OutTmp Len Hmdty  
Heat Skin   Exit Dew Cndnst Cndctv Dens Remove?

Sounpak® Rectangular Silencer Selector

This web tool calculates recommended Sounpak rectangular silencer models for given physical, acoustical, and pressure specifications. It also displays applicable data for the suggested silencers. The only fields required are the volume flow rate, the width, and the height. All other fields that are blank will be treated as "don't care" values. The Sounpak model designations are links that will take you to detailed data for that silencer. The Save Result column button can be used to save the silencer to a schedule that is shown at the bottom of the page.
Enter Required Insertion Loss for the following:
** Click models in the Soundpak Model column to view PDF datasheets!
Soundpak Silencer Results
Soundpak Model Length 63 Hz dB 125 Hz dB 250 Hz dB 500 Hz dB 1K Hz dB 2K Hz dB 4K Hz dB 8K Hz dB Pressure Drop (inches of water) Weight (lbs) Selection Save Result
Results Key
Soundpak Model Color Code Insertion Loss/Pressure Drop Color Code Selection Color Code
Designation
Standard Sounpak Silencer
Value
Insertion Loss Is within 0.5dB for the Octave or Pressure Drop Is within 10%
A
Sounpak Silencer Meets or Exceeds Required Insertion Loss and Pressure Drop
Designation
Sounpak Silencer with a Vapor Barrier
Value
Insertion Loss Is within 6dB for 63 Hz or 3dB for All Other Octaves or Pressure Drop Is within 20%
B
Sounpak Silencer Meets Required Insertion Loss or Pressure Drop within ASTM Interlaboratory Variance
Designation
Sounpak Silencer with a Special Order Vapor Barrier Approved by the FDA
Value
Insertion Loss Is within 7dB for At Least One Octave or Pressure Drop Is within 50%
C D E
Sounpak Silencer Meets Required Insertion Loss or Pressure Drop within ASTM Interlaboratory Variance
Note:
  1. ASTM interlaboratory testing has shown insertion loss may vary as much as 6 dB in the 63 Hz band, and 3 dB for all other frequencies.
  2. Results are not guaranteed for accuracy. McGill AirFlow/AirSilence LLC has made every effort possible to ensure correct methodology and use of public domain information. It is up to the user to verify the accuracy of calculations.
  3. For more information on all silencers, please open the following file: Sounpak Silencers Performance Data.pdf (file size: 3.5 mb).
Sounpak Silencer Saved Selection Schedule
Tag Model Length Width Height Press Drop Weight Remove?
63 Hz 125 Hz 250 Hz 500 Hz 1K Hz 2K Hz 4K Hz 8K Hz

Sounpak® Round Silencer Selector

This web tool calculates recommended Sounpak round silencer models for given physical, acoustical, and pressure specifications. It also displays applicable data for the suggested silencers. The only fields required are the volume flow rate, the width, and the height. All other fields that are blank will be treated as "don't care" values. The Sounpak model designations are links that will take you to detailed data for that silencer. The Save Result column button can be used to save the silencer to a schedule that is shown at the bottom of the page.
Enter Required Insertion Loss for the following:
** Click models in the Soundpak Model column to view PDF datasheets!
Soundpak Silencer Results
Soundpak Model Length 63 Hz dB 125 Hz dB 250 Hz dB 500 Hz dB 1K Hz dB 2K Hz dB 4K Hz dB 8K Hz dB Pressure Drop (inches of water) Weight (lbs) Selection Save Result
Results Key
Soundpak Model Color Code Insertion Loss/Pressure Drop Color Code Selection Color Code
Designation
Standard Sounpak Silencer
Value
Insertion Loss Is within 0.5dB for the Octave or Pressure Drop Is within 10%
A
Sounpak Silencer Meets or Exceeds Required Insertion Loss and Pressure Drop
Designation
Sounpak Silencer with a Vapor Barrier
Value
Insertion Loss Is within 6dB for 63 Hz or 3dB for All Other Octaves or Pressure Drop Is within 20%
B
Sounpak Silencer Meets Required Insertion Loss or Pressure Drop within ASTM Interlaboratory Variance
Designation
Sounpak Silencer with a Special Order Vapor Barrier Approved by the FDA
Value
Insertion Loss Is within 7dB for At Least One Octave or Pressure Drop Is within 50%
C D E
Sounpak Silencer Meets Required Insertion Loss or Pressure Drop within ASTM Interlaboratory Variance
Note:
  1. ASTM interlaboratory testing has shown insertion loss may vary as much as 6 dB in the 63 Hz band, and 3 dB for all other frequencies.
  2. Results are not guaranteed for accuracy. McGill AirFlow/AirSilence LLC has made every effort possible to ensure correct methodology and use of public domain information. It is up to the user to verify the accuracy of calculations.
  3. For more information on all silencers, please open the following file: Sounpak Silencers Performance Data.pdf (file size: 3.5 mb).
Sounpak Silencer Saved Selection Schedule
Tag Model Length Diameter Press Drop Weight Remove?
63 Hz 125 Hz 250 Hz 500 Hz 1K Hz 2K Hz 4K Hz 8K Hz

Pressure / Stiffener / Gauge

This web tool is used for calculating the recommended operating pressure, stiffener spacing, or gauge for round duct. Calculated values are rounded to the nearest 0.1 in. wg.
The diameter must be greater than zero.
The temperature must be greater than zero.
The stiffener spacing must be greater than zero.
Results:
Recommended Operating Pressure:
0 in. wg
 
Stiffener Size:
Duct Type Spiral Material Diameter Duct Temp Gauge / Class Ring Spacing Pressure Result Value Result Unit Stiffener Size Remove?

Burst / Collapse

This web tool is used for calculating the burst or collapse pressure for round duct with no reinforcement. Calculated values are rounded to the nearest 0.1 in. wg.
The diameter must be greater than zero.
The temperature must be greater than zero.
Results:
Burst Pressure:
Operating Pressure:
0
0
Calc Type Spiral Material Diameter Duct Temp Gauge / Class Burst / Collapse Pressure Operating Pressure Remove>

Support Design

This web tool checks if the supplied information can handle the calculated load.
Safety factor must be greater than zero.
The diameter must be greater than zero.
Wind velocity must be greater than zero.
Snow load must be greater than zero.
Ring spacing must be greater than zero.
Results:
Material Load:
Allowed Deflection:
Actual Deflection:
Max Length:
Pass/Fail:
0 lb/in
0 in.
0 in.
0 ft.
Insul. Safety Spiral Mat. Dia. Wind Snow Spacing In Out Load
Act. Def. Max Len. Mat. Load Dnsty Pass?   Remove>

Stack Design Check

This web tool checks if the supplied information can handle the calculated load.
Safety factor must be greater than zero.
The diameter must be greater than zero.
Wind velocity must be greater than zero.
Height must be greater than zero.
Results:
Critical Velocity:
Actual Stress:
Critical Buckling:
Critical Yield:
Deflection:
Pass/Fail:
0 mph
0 psi
0 psi
0 psi
0
Safety Spiral Mat. Dia. Wind Ht. Ga.
Vel. Stress Buck Yield Def Pass? Remove?

Underground Design Check

This web tool checks if the supplied information can handle the calculated load.
The distributed load must be greater than zero.
The diameter must be greater than zero.
The soil density must be greater than zero.
The depth must be greater than zero.
Results:
Soil Load:
External Load:
Total Load:
Deflection:
Max Depth:
Pass/Fail:
0 psi
0 psi
0 psi
0 in
0 ft
Spiral Type DLoad Vehcl Area Matl. Dia. Ga. Dnsty
Depth Mod SLoad ELoad TLoad Def. Max Dep Pass? Remove?

Flat Oval and Rectangular Duct Reinforcement

This web tool calculates the gauge or reinforcement needed for flat oval or rectangular duct.
The minor must be greater than zero.
The major must be greater than zero.
Results:
Minor Reinforcement:
Major Reinforcment:
Calculated Gauge:


0
Type Calc PClass App Min Maj Ga. Space MinR MajR CalcGa. Remove?

Special Tube Designer Tool

This web tool calculates the pressure drop across the orifice and diffuser plate and also calculates the fan pressure required.
Pressure must be greater than zero.
Maximum leakage be greater than zero.
Tube Diameter: 4 in.   
Orifice Diameter: 1.5 in.   
Results:
Beta Ratio:
0
 
System Static Pressure:
0 in wg
 
Allowed System Leakage:
0 cfm
 
Perf Plate % Open Area:
%
Flow Rate (cfm) Press. Drop Across Orifice (in wg) Press. Drop Across Plate (in wg) Fan Pressure Req. (in wg) Save Result?
Press CFM Plate TDia. ODia. Beta Area Flow PDO PDP Fan Remove?

Duct-D-Fuser Designer Tool

This web tool calculates the sections of Duct-D-Fuser needed for an application.
Diameter must be greater than zero.
CFM must be greater than zero.
Length must be greater than zero.
Results:
Section Number
Duct Diameter
Orifice or Reducer Diameter
Entering Velocity: 0 fpm
Total PressureDrop: 0 in wg

Factair Designer Tool

This web tool calculates the max velocity, pressure drop, and acoustical information needed for an application.
Velocity must be greater than zero.
Results:
Max Throw Velocity:
Pressure Drop:
0 ft
0 in wg
Factair Generated Noise Levels
63 Hz:
125 Hz:
250 Hz:
500 Hz:
1K Hz:
2K Hz:
4K Hz:
8K Hz:
0 db
0 db
0 db
0 db
0 db
0 db
0 db
0 db
Model Vel Pos Dist MaxV Press Remove?
63 125 250 500 1K 2K 4K 8K

Offset Designer Tool

This web tool calculates the angle and duct length.
Diameter must be greater than zero.
Distance must be greater than zero.
Length must be greater than zero.
Results:
Angle of Elbows:
90°
 
Duct Length (in):
0
Type Conn Dia Dist Len Cntr1 Cntr2 Ang Desc Value Remove?

Acoustical Designer Tool

This web tool calculates the acoustical information for the application.
Enter coresponding values in the boxes provided:
Low Levels
63 Hz (db)
Must be greater than zero.
125 Hz (db)
Must be greater than zero.
250 Hz (db)
Must be greater than zero.
500 Hz (db)
Must be greater than zero.
1K Hz (db)
Must be greater than zero.
2K Hz (db)
Must be greater than zero.
4K Hz (db)
Must be greater than zero.
8K Hz (db)
Must be greater than zero.
Results:Low A Levels
63 Hz (db):
125 Hz (db):
250 Hz (db):
500 Hz (db):
1K Hz (db):
2K Hz (db):
4K Hz (db):
8K Hz (db):
Overall dBA: 		0
0
0
0
0
0
0
0
0