Arkansas HVACR NewsMagazine November 2018

S tate, National, Chapter News Education News

City of Little Rock

REQUIRED DUCT TESTING

Update and New Class

production housing or apartments. If the project has 200 or fewer units with the same floor plan, then only 20% of those units must be tested. If the project has over 200 units with the same floor plan, then only 10% of those units must be tested. There is one other criteria that developers and HVACR contractors must remember. If the project uses the same HVACR contractor for all of the units, then the 20% and 10% rule applies; however, if the projects uses more than one HVACR contractor, the 20% rule applies even if there are over 200 units. In other words, multiple HVACR contractors automatically establish the number of units tested at 20%. To accommodate those that did not attend one of the first four classes, another class is scheduled for January 9, 2019 from 1 p.m. to 5 p.m. at the PTC Business & Industry Center at 3303 E. Roosevelt Road, Little Rock. You can register by contacting the Association office at 501-487-8655 or email tomhunt@arhvacr.org

106 Complete Class Over four afternoons, 106 contractors or their techs completed the first round of Duct Leakage Training to be a certified Total Duct Leakage Tester in the City of Little Rock. The certification allows them to test their own total duct leakage or to offer the service to another contractor. Bottom line is that virtually all new residential construction duct must be tested and be equal to or less than the leakage maximum for the builder to receive a certificate of occupancy. Duct is tested to 25 Paschals or about 0.1 inches of water column. The maximum leakage is based on a tested rate per 100 sq. ft. of conditioned floor area. At rough in Without air hander in place 4 CFM With air handler in place 6 CFM At final To outside – 8 CFM Total – 12 CFM All individual stand alone homes must be tested but the code allows leeway in cases of track /