cost of mobile sprial classifiers

Round and flat oval spiral ducts constructed to Seal Class A are expected to leak 3 cfm/100 ft 2 duct surface area at 1 WG. 9. You’re going to have a hard time meeting the ASHRAE Standard 90.1-2013 Energy Code – it states “Ductwork and all plenums with pressure class ratings shall be constructed to Seal Class A, as required to meet the ...