• Skip to primary navigation
  • Skip to main content
Oriflow, LLC
727-400-4881
  • 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
You are here: Home / Technical / ANSI/ASHRAE 90.1-2010 – Leakage Specification

ANSI/ASHRAE 90.1-2010 – Leakage Specification

As of 2010, Standard 90.1 (addendum cq) dictates that ductwork that is designed to operate at a static pressure greater than 3 in.wg., and all ductwork located outdoors, shall be leak tested, and the maximum permissible leakage shall be determined using a leakage class of 4 for both round and rectangular duct.

Furthermore, the building owner (or designated representative) shall select representative sections totaling no less than 25 percent of the total installed ductwork, by duct surface area.

In other words, if the ductwork totals 1000 square feet of surface area, no less than 250 square feet of that system shall be tested for air leakage IF:

  1. The system is designed to operate at a pressure greater than 3 in.wg., or
  2. The system is located outdoors.

Status of State Energy Codes

Your state may or may not have adopted Standard 90.1-2010. To see the current list of the statewide code adoption per the U.S. Department of Energy, click here.

Since many Engineers are unaware of their local or state’s code in regard to allowable duct leakage, their specification may not be current. You may see specifications that refer to leakage classes that vary by construction type (round or rectangular), and also requirements that testing be done at pressures higher than the design pressure, which may not be required if your state has adopted one of the recent versions of Standard 90.1.

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

sales@oriflow.com
Tel: 727-400-4881

© 2015-2021, All rights reserved

Site by Industrial Webworks

MENU
  • 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