Slideshow: Ductwork Don'ts

Slideshow: Ductwork Don'ts

The best hvac unit in the world is useless if you can’t deliver conditioned air to rooms. Avoid constrictions of ducts reduce airflow and increase static pressure.

Slideshow: Ductwork Don'ts

Keep ducts as straight as possible. A 90-degree turn is the smallest any bend should be; bends should not look like this.

Slideshow: Ductwork Don'ts

This metal duct has some, but not all, seams sealed, and it is not insulated—conditions that will significantly lower the discharge temperature at the supply register.

Slideshow: Ductwork Don'ts

Unsealed and uninsulated metal ductwork will drive winter discharge temperatures even lower.

Slideshow: Ductwork Don'ts

This is the wrong way to connect flex duct to supply registers. Unfortunately, this sort of poor connection is all too common with flex duct.

Slideshow: Ductwork Don'ts

This is the correct way: The inner liner and the outer jacket must be taped separately and the connection mechanically reinforced.

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