Q:Two Questions: 1. Is it noisy when it's flapping or during its final closing? 2. Do both sides of that valve bend up to allow the for the full 8" diameter of airflow?
by|Apr 26, 2019
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A: Hello, Sorry about the trouble. I believe the 8" and 6" rounds are a single flap. If you wish, send me an email and I will forward your email and question to one of our engineers who might have suggestions. m.holmes@elica.com