does it open n close as needed?
2
Hi Wayno, This item can not be open&close, it can be used with a butterfly damper to achieve open, close or adjust the air volume. You can visit this link for the get a suitable butterfly damper: https://www.lowes.com/pd/ReliaBilt-6in-Round-Damper-Brown/5001993327 Any further questions, please contact us anytime!
Was this Answer Helpful ?No. You need the thing inside the duct, which this covers, as a damper to open and close.
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