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You are here: Home / Software / Allowable Leakage based on SMACNA Leakage Class

Allowable Leakage based on SMACNA Leakage Class

SMACNA and NEBB recommend use of leakage class for specifying allowable leakage. To calculate allowable leakage, you must know the system surface area, the required test pressure and the specified leakage class.

Max Allowable Leakage by SMACNA class
sq.ft.
(in.wg.)
cfm
*SMACNA recommends using leakage classes in table below when the designer has not designated leakage limits. Please refer to the SMACNA HVAC Air Duct Leakage Manual published by Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA).
Duct Class4, 6, 10 in.wg.3 in.wg.1/2, 1, 2 in.wg.
Seal ClassABC
What gets sealed?Joints, seams, wall penetrationsTransverse joints and seamsTransverse joints
Metal Rectangular DuctLeakage Class = 4Leakage Class = 8Leakage Class = 16
Metal Round DuctLeakage Class = 2Leakage Class = 4Leakage Class = 8
 
We assume no liability for use of this program. We have made every effort available to make sure this program calculates correctly. Calculation of allowable leakage using leakage class is derived from SMACNA HVAC Air Duct Leakage Test Manual – 2nd Edition.

Oriflow, LLC 2125 Range Rd., Suite B - Clearwater, Florida 33765

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Tel: 727-400-4881

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  • Home
  • Products
    • Compare Models
    • Cobra Tester
    • Panther Tester
    • Rhino Tester
    • Accessories
      • Smoke Machines
      • Flexible Duct
      • Dust Covers
  • Contact Us
  • Technical
    • All Technical Topics
    • Introduction to Allowable Leakage Specification
    • Technical Calibrations
    • ANSI/ASHRAE 90.1-2010 – Leakage Specification
    • Duct Leak Testing Supply System
    • Duct Leakage Testing – RETURN SYSTEM
    • Orifice Plates
    • Manometers
  • Software
    • Online Programs
      • Allowable Leakage based on SMACNA Leakage Class
      • Allowable Leakage based on Percentage on System CFM
      • Allowable Leakage based on DW/143 Duct Pressure Class
    • Download Duct Test Sheets (calculate allowable leakage, duct surface area and more!)
      • Oriflow Duct Leakage Test Sheet: SMACNA Leakage Class
      • Oriflow Duct Leakage Test Sheet: Percent Allowable
  • Videos
  • Testimonials
  • Request a Quote