A measuring tool and device designed to allow for the quick determination for the location and marking of a rough in opening in the installation of HVAC components. The device is generally comprised of planar body having a specific dimension and including at least one aperture placed within a perimeter of the planar body corresponding to the size of a desired HVAC opening. Accordingly, the device can be generally utilized by a user to quickly mark the rough in opening by placing the device on a floor surface aligned with a soleplate and framing studs and floor joists.
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