TinnerFlow™2nd YearVAVs & Fan CoilsYELLOW · Check First
Use a factory-built or shop-fabricated square-to-round transition fitting. * Ensure the angle of the transition slope does not exceed 30^\circ (per SMACNA guidelines) to prevent excessive static pressure drops and turbulent air noise right before it hits the box sensor.
Use a factory-built or shop-fabricated square-to-round transition fitting. * Ensure the angle of the transition slope does not exceed 30^\circ (per SMACNA guidelines) to prevent excessive static pressure drops and turbulent air noise right before it hits the box sensor.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.