Standard 4×8 Galvanized Steel Sheet | HVAC Ductwork Grade
Standard 4×8 Galvanized Steel Sheet | HVAC Ductwork Grade: 6 Secrets to Avoid Costly Mistakes Introduction: Why “Standard” Isn’t Always Enough Did you know 28% of HVAC duct failures trace back to subpar 4×8 galvanized steel sheets? (SMACNA, 2023). While these sheets dominate ductwork, hidden flaws in zinc coatings and flatness can sabotage airflow and […]
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