Hi guys question for you experts out there

Yishai Sprung
last month
last modified: last month

I have a Hvac closet that is located on the second floor of my townhouse. I have a open return pipe without a vent in the ceiling leading to the attic . the warranty department is claiming that hole is on purpose for better results of the AC unit And thats is why no vent was placed on that returning duct. should there be a vent cover or not?

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