Abstract: An expandable intervertebral cage, having: a top plate with rotatable leaves thereon; a bottom plate with rotatable leaves thereon; front and rear wedges; and a deployment mechanism that moves the front or rear wedges to rotate the leaves on the top and bottom plates into a deployed position that increases the width of the intervertebral cage. The deployment mechanism also moves the wedges to push the top and bottom plates farther apart thereby increasing the height of the intervertebral cage, or moves one of the wedges while keeping the other wedge stationary to vary a lordosis angle for the intervertebral cage.

Abstract: A fire pit includes an combustion chamber having at least one wall defining an inner chamber. At least one primary air aperture is defined through the inner chamber wall at a first, lower level, and at least one secondary air aperture is defined through the inner chamber wall at a second, upper level. A fuel grate is supported within the inner chamber at a level between the lower level and the upper level.

Abstract: A ventilation fan configured to be positioned adjacent to a room of a building structure to ventilate the room is disclosed. The ventilation fan has a fan housing with an external wall defining an internal region. A blower is configured to be located in the internal region. A tongue extends from one of the fan housing and the blower and a slot is defined by one of the fan housing and the blower. The slot configured to receive the tongue to secure the blower to the fan housing.

Abstract: A ventilation system having a housing defining an internal region and the housing configured to be positioned adjacent to a room of a building structure, a blower in the internal region and configured to draw air out of the room of the building structure, and a grille configured to at least partially block view of the housing and the blower. The grille has a trim cover configured to connect to at least one of the main housing, the blower and the room. The trim cover has at least one side element configured to define an aperture and a hanger connected to the at least one side element. The hanger has a base. A grille cover is configured to engage the base.

Abstract: A ventilating fan having a fan housing formed to define an interior space, an inlet opening, and an outlet opening spaced apart from the inlet opening. A fan wheel is arranged to lie within the interior space defining an axis of rotation about which the fan wheel is configured to rotate. The fan wheel has a hub, a plurality of fan blades having a hub end secured to the hub and an opposing inlet end configured to be located adjacent to the inlet opening. A plate extending over the fan blade inlet ends.

Abstract: A support pole is received in a pole receiver. The pole has an outwardly biased spring tab that is compressible by an inside surface of the pole receiver until the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole.

Abstract: A ventilation unit have a scroll defining an interior space, a blower wheel located in the interior space to be driven in rotation to draw air into the interior space to ventilate a room. The blower wheel includes a wheel hub mounted to the motor, a plurality of fan blades coupled to an upper end of the wheel hub and spaced circumferentially about the axis, and a support ring coupled to a radially-outer edge of the plurality of fan blades. The wheel hub includes a central motor mount, a peripheral blade mount ring coupled to each of the plurality of fan blades and a plurality of spokes interconnecting the central motor mount and the peripheral blade mount ring. Each of the spokes have an airfoil-shaped cross section.

Abstract: An expandable intervertebral cage, having: a top plate with rotatable leaves thereon; a bottom plate with rotatable leaves thereon; front and rear wedges; and a deployment mechanism that moves the front or rear wedges to rotate the leaves on the top and bottom plates into a deployed position that increases the width of the intervertebral cage. The deployment mechanism also moves the wedges to push the top and bottom plates farther apart thereby increasing the height of the intervertebral cage, or moves one of the wedges while keeping the other wedge stationary to vary a lordosis angle for the intervertebral cage.

Abstract: A fire pit includes an engine having at least one wall defining an inner chamber. At least one primary air aperture is defined through the inner chamber wall at a first, lower level, and at least one secondary air aperture is defined through the inner chamber wall at a second, upper level. A fuel grate is supported within the inner chamber at a level between the lower level and the upper level.

Abstract: A ventilation fan wheel having a wheel hub. A plurality of peripheral fan blades are coupled to an outer edge of the wheel hub and spaced apart circumferentially about a rotation axis of the fan wheel. A plurality of impeller fan blades extend from the wheel hub radially between the rotation axis and the plurality of peripheral fan blades.

Abstract: A fire pit includes an engine having at least one wall defining an inner chamber. At least one primary air aperture is defined through the inner chamber wall at a first, lower level, and at least one secondary air aperture is defined through the inner chamber wall at a second, upper level. A fuel grate is supported within the inner chamber at a level between the lower level and the upper level.

Abstract: A support pole is received in a pole receiver. The pole has an outwardly biased spring tab that is compressible by an inside surface of the pole receiver until the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole.

Abstract: A support pole is received in a pole receiver. The pole has an outwardly biased spring tab that is compressible by an inside surface of the pole receiver until the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole.

Abstract: A fire pit screen has a fire pit screen lower portion including an upright screen wall defining a top opening and a bottom opening, and a fire pit screen upper portion comprising a screen top panel sized to fit on top of the screen wall covering the top opening thereof.

Abstract: A table accessory for use with a fire pit. The table accessory may be supported by a fire pit for use as a table, for supporting a storage cover, or, when the fire pit is in use, may be moved below the fire pit for use as a heat shield. A plurality of accessory legs extend from the lower surface of the body. The terminal ends of the accessory legs are configured to be received on a top panel of the fire pit. A fire pit stand has a plurality of fire pit legs for supporting the fire pit. The fire pit legs define a fire pit leg height. The height of the table accessory is less than the fire pit leg height for facilitating locating the table accessory under the fire pit chamber of the fire pit for use of the table accessory as a heat shield.

Abstract: A support pole is received in a pole receiver. The pole has an outwardly biased spring tab that is compressible by an inside surface of the pole receiver until the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole.

Abstract: A torch and support pole combination has a wick extending upwardly therefrom. A pole adapter with a pole receiver is affixed to a torch assembly. A support pole is received in the pole receiver. The pole has an outwardly biased spring tab that is compressible by an inside surface of the pole receiver until the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole. The upper end of the pole is inserted into the pole receiver. The outwardly biased spring tab on the pole is compressed with an inside surface of the pole receiver. Compression of the spring tab is relieved when the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole.

Abstract: A torch and support pole combination has a wick extending upwardly therefrom. A pole adapter with a pole receiver is affixed to a torch assembly. A support pole is received in the pole receiver. The pole has an outwardly biased spring tab that is compressible by an inside surface of the pole receiver until the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole. The upper end of the pole is inserted into the pole receiver. The outwardly biased spring tab on the pole is compressed with an inside surface of the pole receiver. Compression of the spring tab is relieved when the spring tab is inserted to a location above a top surface of the pole receiver, thereby creating a secure attachment of the torch assembly to the pole.

Abstract: A table accessory for use with a fire pit. The table accessory may be supported by a fire pit for use as a table, for supporting a storage cover, or, when the fire pit is in use, may be moved below the fire pit for use as a heat shield. A plurality of accessory legs extend from the lower surface of the body. The terminal ends of the accessory legs are configured to be received on a top panel of the fire pit. A fire pit stand has a plurality of fire pit legs for supporting the fire pit. The fire pit legs define a fire pit leg height. The height of the table accessory is less than the fire pit leg height for facilitating locating the table accessory under the fire pit chamber of the fire pit for use of the table accessory as a heat shield.

Abstract: A fire pit screen has a fire pit screen lower portion including an upright screen wall defining a top opening and a bottom opening, and a fire pit screen upper portion comprising a screen top panel sized to fit on top of the screen wall covering the top opening thereof.