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Quick and easy duct calculations
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When I started doing contracting, I was given a 
cardboard nomograph by one of the equipment suppliers in South Africa.  I 
used this cardboard nomograph until the edges were frayed and it was covered in 
my notes.  I did however find that it was limited because it could not 
compensate for altitude, different duct internal roughness or temperature.  
This program is based on fundamentals and has 
complete flexibility in data input. 
  
    
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        - Allows easy recalculation of all values.
 
        - Accounts for atmospheric pressure and temperature.
 
        - Select altitude from World Locations database.
 
        - Customisable duct friction factors.
 
        - Calculates equivalent rectangular duct clear 
		dimensions.
 
        - Allows fixing of any rectangular dimension, program 
		calculates the other.
 
        - Based on calculation procedure in ASHRAE Fundamentals 
		Handbook.
 
        - Work in any unit system, simply click 
		on the units the change.
 
       
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    | You don't have to work in a fixed set of units Change 
	any units to suit your needs.  We have made this feature especially 
	flexible.  Just right-click on the unit and choose from any of the 
	options to convert.  | 
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