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This is a three-pack of foam panels that fill the gap between a portable AC's window vent kit and the window frame. Each panel is 16.5 by 6.3 inches, and together they cover up to 50 inches of vent length, cut to fit. The foam blocks outside air and dampens some noise, which is the main thing cheaper plastic-only seal kits leave open. It suits renters and anyone with a sliding or sash window who wants a tighter seal without permanent work.
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Lowest price we've seen: $19.53 on Nov 4 at Walmart; highest $19.99 on Nov 14. Tracked across 2 stores since Nov 4.
This set of three foam insulation boards fills the gap around a portable AC window vent. The panels are made of a special foam designed for insulation, toughness, and resistance to wear and aging.
The boards block hot and cold air from leaking in, and they reduce outside noise. They work with most portable AC window seal kits. Together the three panels cover up to 50 inches of window vent length, and they can be customized to the size you need. Installation takes a few minutes with the included parts.