Abstract: A golf putting practice device adapted to serve as a substitute for a floor vent that fits into a floor duct of a forced air circulation system of a building and includes a ball receiving enclosure and at least one flat support plate member extended outwardly from the ball receiving enclosure. The front wall of the ball receiving enclosure includes a notched portion that provides a golf ball open access to the enclosure when the device is installed into a floor duct. A plurality of apertures are formed in the support plate member to allow for air flow through the plate. A floor air vent cover includes a centrally located closed bottom depression the size of a golf putting cup for receiving and retaining a putted golf ball. The opposite ends of the cover contain air passage openings having tapered sides for directing the air flow away from said depression.