A base of a humidifier includes a housing, an air outlet assembly, and a first partition. The housing includes a receiving chamber, a first air inlet, and a second air inlet. The air outlet assembly is disposed in the receiving chamber and includes a fan, a temperature and humidity sensor, and an aroma component. The first partition is disposed in the receiving chamber and configured to spatially separate the temperature and humidity sensor from the fan and the aroma component. The fan is configured to introduce a first airflow from the first air inlet to pass through the temperature and humidity sensor, and reach the fan; introduce a second airflow flow from the second air inlet to pass through the aroma component without passing through the temperature and humidity sensor, and reach the fan; and discharge the first second airflow out of the receiving chamber through the air outlet.

A pump-fan assembly of an air modification device may include a fan, a pump and a disk. The fan may include a central hub disposed on a top surface of the disk, and a plurality of blades extending from the hub towards an outer circumferential edge of the disk. The pump may include a hollow pump body defining an inner tubular passage between an inlet end and a discharge end. An impeller may be arranged at the inlet end and an outlet port may be arranged at the discharge end. The pump and the fan may be coupled at an interface between the discharge end of the pump body and a bottom surface of the disk. The outlet port may be disposed in the interface and arranged to guide a stream of pumped liquid along the bottom surface of the disk. The disk may define a liquid barrier.

An odor containment and elimination device includes a containment center, first pathway, second pathway, and third pathway. The containment center can be configured to receive an odorous item that emits a contaminated air including an odor. The first pathway can be in fluid communication with the containment center and an outside environment and configured to allow contaminated air to travel from the containment center to a first release point while inhibiting seeping of the contaminated air from the first pathway into the outside environment prior to the first release point. The second pathway can be in fluid communication with the containment center and the outside environment via a first intake. The third pathway can be in fluid communication with the containment center and the outside environment and configured to reduce contaminated air released into the environment and/or direct the contaminated air through a door or window.

An odor containment and elimination device includes a containment center, first pathway, second pathway, and third pathway. The containment center can be configured to receive an odorous item that emits a contaminated air including an odor. The first pathway can be in fluid communication with the containment center and an outside environment and configured to allow contaminated air to travel from the containment center to a first release point while inhibiting seeping of the contaminated air from the first pathway into the outside environment prior to the first release point. The second pathway can be in fluid communication with the containment center and the outside environment via a first intake. The third pathway can be in fluid communication with the containment center and the outside environment and configured to reduce contaminated air released into the environment and/or direct the contaminated air through a door or window.

A method of maintaining a desired level of an aerosolized compound within a space to be treated with the compound, the method including providing a diffusion device with the compound in liquid form and a control system for operating the device. The control system includes a sensor in fluid communication with the air within the space to be treated configured to sense the concentration of the compound aerosolized within the space. The diffusion device is operated to diffuse the compound into the space. The concentration of the compound within the space to be treated is sensed with the sensor and operation of the diffusion device is altered based on the concentration of the compound sensed to achieve a desired concentration of compound within the space. The sensing and operation altering steps are repeated periodically to maintain the desired concentration of the compound within the space.

A scent adjustment system includes a scent emitter arranged to supply a scent material to a target space, a storage, and a controller. The storage stores sensory information in which an intensity of a smell of the scent material perceived by a person and a concentration of the scent material are associated with each other. The controller adjusts the concentration of the scent material supplied from the scent emitter based on the sensory information stored in the storage.

A scent adjustment system includes a scent emitter arranged to supply a scent material to a target space, a storage, and a controller. The storage stores sensory information in which an intensity of a smell of the scent material perceived by a person and a concentration of the scent material are associated with each other. The controller adjusts the concentration of the scent material supplied from the scent emitter based on the sensory information stored in the storage.

A refill for holding at least two compositions comprises a container including a body and first and second compositions disposed within the body such that the first and second compositions are substantially separated and the second composition is disposed above the first composition. The refill further includes a tube disposed within the body of the container such that the tube contains the first and second compositions, wherein the tube has an inner diameter and an outer diameter. Still further, the refill includes a wick disposed within the tube, wherein the wick contains the first and second compositions and has a diameter that is smaller than the inner diameter of the tube to create a gap between the wick and the tube.

A fragrance container of a scenting device, having a wall enclosing an interior space, wherein at least one air inlet opening and at least one air outlet opening are provided in the wall for air to flow through the fragrance container, wherein at least one carrier medium for a fragrance is arranged in the interior space of the fragrance container, wherein the at least one carrier medium has a plurality of free surfaces along which the air can flow through from the air inlet opening to the air outlet opening for the purpose of absorbing the fragrance.

A fragrance container of a scenting device, having a wall enclosing an interior space, wherein at least one air inlet opening and at least one air outlet opening are provided in the wall for air to flow through the fragrance container, wherein at least one carrier medium for a fragrance is arranged in the interior space of the fragrance container, wherein the at least one carrier medium has a plurality of free surfaces along which the air can flow through from the air inlet opening to the air outlet opening for the purpose of absorbing the fragrance.