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/ft^{2}
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.
Please fill in the tag field before selecting silencers to save.
Enter Required Insertion Loss for the following:
** Click models in the Soundpak Model column to view PDF datasheets!
To save silencers for comparison, enter the tag information at the top of the page.
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:
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.
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.
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.
Please fill in the tag field before selecting silencers to save.
Enter Required Insertion Loss for the following:
** Click models in the Soundpak Model column to view PDF datasheets!
To save silencers for comparison, enter the tag information at the top of the page.
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:
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.
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.
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.