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            Manual Q - Commercial Low Pressure, Low Velocity Duct System DesignMSRP:$85.95    Duct Calculation Slide RuleMSRP:$69.95    Contractor Exam CalculatorMSRP:$48.95- 
        
              Manual Q - Commercial Low Pressure, Low Velocity Duct System DesignManual Q is your one-stop refer?ence book on the low-pressure, low-velocity systems used in small and mid-size commercial buildings. Manual Q gives yo… Read More>>  Duct Calculation Slide RuleOne of our most popular catalog items! This durable two sided plastic sizing wheel comes with a complete instruction manual for residential and commer… Read More>>  Contractor Exam CalculatorThe Material Estimator is one of the few calculators allowed in the exam and is designed for contractors, trades people and estimating professionals w… Read More>>
 
 
          
          
               
            
        