What type of welds are required on seams joining ducts to ducts?

What type of welds are required on seams joining ducts to ducts?

• A. Liquid-tight, continuously external welds
• B. Screwed joints with sealant
• C. Riveted joints
• D. Duct tape seals

Answer: (A)

Seams joining ducts must be made with liquid-tight, continuously external welds. This creates a complete seal around the joint, preventing grease-laden air from leaking and helping maintain fire safety and efficient airflow. External, continuous welds are also easier to inspect and maintain. Screwed joints with sealant can loosen under heat and vibration, riveted joints aren’t the standard for modern kitchen ducts and may not provide a airtight seal, and duct tape cannot withstand grease and heat or meet proper sealing codes.

Seams joining ducts must be made with liquid-tight, continuously external welds. This creates a complete seal around the joint, preventing grease-laden air from leaking and helping maintain fire safety and efficient airflow. External, continuous welds are also easier to inspect and maintain. Screwed joints with sealant can loosen under heat and vibration, riveted joints aren’t the standard for modern kitchen ducts and may not provide a airtight seal, and duct tape cannot withstand grease and heat or meet proper sealing codes.