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The M-D BUILDING PRODUCTS 08308 is a foam insulating side panel designed for window-mounted air conditioner installations. Each panel measures 9 inches wide by 18 inches high by 7/8 inches thick and fills the gap between the window AC unit and the window frame. The foam construction reduces noise and vibration transmission while blocking unconditioned air from entering or exiting around the unit. Self-adhesive installation strips are included, making this suitable for both new installations and replacements. Two side panels are included per package.
This panel is used in residential window AC installations where the accordion-style side panels on the unit are insufficient or damaged. The foam material can be trimmed with a utility knife to fit most standard window air conditioner units. The plastic channel is cut to the proper height alongside the foam panel to complete a flush, draft-free fit. HVAC technicians and building maintenance crews commonly install these during seasonal AC setup or as part of a replacement service call.
Designed as an OEM-style replacement side insulating panel for most residential window-mounted air conditioner units where side gap coverage is required.
Power down and unplug the window AC unit before servicing or replacing side panels. Cut the foam panel and plastic channel to the correct height using a utility knife or scissors before inserting into the window frame opening. Ensure the self-adhesive strips are seated firmly against both the window frame and the AC unit housing to prevent air bypass. No special tools or permits are typically required for this type of installation.
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