Why are Plastic Vents Better?

When was the last time you threw a baseball at one of your roof vents? We do it all the time.

This is how we learned that when you throw a baseball at your average metal vent, it will become dented and bent out of shape. We also learned that more durable plastic vents will not bend or break— as demonstrated in the video below.

Along with being virtually unaffected by the impact of a baseball, there are a number of reasons for choosing plastic vents over metal vents.

“Metal vents — can be susceptible to bent flanges and denting from shipping and handling. Plastic vents are a lot lighter and much more durable.”

Donna Burtch, Duraflo® product manager at Canplas

Why Choose Plastic Vents over Metal?

One good reason to choose a plastic vent is safety because metal has sharp edges. Metal vents have seams, rivets and welding. These give more potential for water to get in, or for an installer to injure themselves.

Metal also lends to more condensation with temperature changes. This also means that the metal will start to corrode and rust.

“If you’re in a place like downtown Toronto, people are concerned that raccoons will chew through the plastic. The raccoon is actually quite an industrious little creature and will also try to pry up a metal or plastic roof vent to gain entry to your attic.”

Donna Burtch, Duraflo® product manager at Canplas


Using plastic is important, but it’s also important to choose the right type of plastic. With a Duraflo® roof vent made from polypropylene (PP), you’re getting a product that won’t crack in temperatures up to -40 degrees Celsius.

Alternatively, polyethylene (PE) resins won’t last in colder climates and will often crack. At Duraflo®, we also include UV protective additives in our proprietary material formulation in our roof vents to ensure our products will not be damaged by the elements.

You can read more about the different types of roof vents, and what works best for your application in our blog here: Choosing the Right Roof Vent.

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