Duraflo Meets International Standards
Why are standards necessary?
It is very difficult to compare ventilation products against one another. Each manufacturer claims its' products will meet your needs in air flow, weathering, rain and snow infiltration and insect/bird prevention.
International standard organizations like CSA test to independent criteria which cover these areas and certifies or rejects product according to the standard.
Here is an example:
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Duraflo claims that the 6050 roof vent has 50 sq. inches of net free air. |
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CSA certifies that this is true. |
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6050 roof vent's throat dimension is approximately 9 1/2" x 9" or 85.5 sq. in. |
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Now take away the restriction caused by the moulded-in screen and the vent ends up with just over 50 sq. inches of net free air. |
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Some manufacturers claim their vent is 50 sq. inches of net free air. |
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This is true if they do not include the restriction caused by the screen. |
What does this mean to you?
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If the house you roof needs 250 sq. inches of ventilation, then five Duraflo vents will do. |
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The other product could require over seven vents to do the same job. |
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That's two extra vents to buy, and two more to install! |
Shingle Warranties
Remember shingle warranties all hinge on proper installation with proper ventilation.
If the shingle life is shortened, maybe it's not the shingle but it may be too little ventilation.
A vent is a vent until there is a problem.
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Make sure your vent is meeting your needs. |
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International Standards protects you and your customer. |