A firefighting apparatus has a positive pressure ventilation system for impairing dust, dirt, and other debris from entering a storage compartment of the apparatus. The system can blow dust, dirt and debris out from the storage compartment if the same enters the compartment. The positive pressure ventilation system includes a blower assembly that supplies a positive flow of air to the storage compartment, such that the pressure within the storage compartments is greater than the environment, and air will egress from the storage compartment into the surrounding environment, rather than entering the storage compartment from the surrounding environment.

A fastening module for connecting a filter system to an arched connecting surface with openings for a fluid has a connecting housing connectable in fluid communication to the filter system. Rigid individual channel pieces are arranged in the connecting housing and channels extend in the channel pieces. The channels correspond with the openings in the arched connecting surface. The channel pieces have connecting flanges to be connected to the openings in the arched connecting surface. The channel pieces are connected by flexible connecting regions with each other; with the connecting housing; or with each other and with the connecting housing. The fastening module is connected in fluid communication to the inlet region or outlet region of the filter system. A filter module for the filter system has substantially free intake across its cross section and enables an intake manifold-type distribution of a volume flow passing through the filter element.

A ram air vent for a vehicle has a base defining a base aperture therein; a hood connected to the base over the base aperture, the hood and base defining a forwardly facing air inlet therebetween, the hood and the base defining an air passage extending from the air inlet to the base aperture; a baffle disposed in the air passage for deflecting air flowing in the air passage from the air inlet for separating water from air flowing in the air passage, the baffle facing the air inlet; and at least one water passage defined in at least one of the base or the hood. The at least one water passage exits a rear side of the ram air vent. The at least one water passage drains water separated from air flowing in the air passage from the ram air vent.

An air vent for a vehicle or vehicle canopy includes an external and an internal duct. The external duct has an inlet and an outlet. The height of the outlet is less than that of the inlet. The inlet and the outlet are arranged such that, in use, an uppermost point of the inlet is located above an uppermost point of the outlet. The internal duct is in fluid communication with the external duct via one or more openings arranged in the internal duct or at a junction between the internal duct and the external duct. The internal duct is configured to be in fluid communication with an interior of the vehicle via a slot defined by the vehicle. The or each opening is arranged such that, in use, the uppermost point of the outlet of the external duct is located below a lowermost point of the or each opening.

A dust reduction device for a vehicle includes an inlet aperture for receiving airflow created as a result of forward movement of the vehicle. The dust reduction device provides a primary airflow path leading from the inlet aperture to a vehicle opening, and a secondary airflow path leading from the inlet aperture to a ventilation exit. During forward movement of the vehicle, the primary airflow path is substantially blocked by airflow from the secondary airflow path such that airflow from the primary airflow path is provided to the vehicle opening and into the vehicle thereby minimising dust ingress in the vehicle.

A tray for holding a cabin air filter that filters airflow entering a vehicle passenger cabin. The tray includes a frame configured to hold the cabin air filter. A retention member includes a first end attached to the frame and a second end configured to be anchored at a mounting location in a vehicle. When the frame is moved away from the mounting location, the retention member is tensioned to (i) guide and pull the flexible frame towards the mounting location and/or (ii) hold the flexible frame at the mounting location.

An air quality system includes an air precleaner, a filter identification component, and a control module. The air precleaner has a precleaner housing and a filter disposed inside the precleaner housing. The filter identification component is positioned within the precleaner housing at a first position and is mounted on the filter. The control module is positioned within the precleaner housing at a second position and is configured to emit an electrical field and communicate with the filter identification component via the emitted electrical field.

An air-conditioning system for a vehicle includes: a blower unit connected to an internal air flow path and an external air flow path and configured to selectively suction or discharge air; a flow path housing configured to guide air suctioned through the blower unit to the interior of the vehicle; a carbon dioxide capture module configured to selectively capture carbon dioxide contained in the air flowing into the flow path housing; and a door disposed between the flow path housing and the carbon dioxide capture module in order to selectively open or close the flow path housing.

Embodiments of the present invention provide techniques for ventilating an enclosure such as the cargo space of a vehicle. In an example implementation, a ventilator is affixed to an external wall (e.g., the roof) of the cargo space. The ventilator includes a ram inlet that flows into a venturi, along one or more openings in a boundary of the cargo space, and exits at an outlet. When the vehicle is in motion, external airflow enters the ram inlet, gets compressed in the venturi, and travels over the top of the boundary, generating a high shear that pulls airflow from the cargo space, into the diffuser, and out the outlet. The ventilator may include an electric fan that generates suction from the cargo space when the vehicle is stationary, and a moveable flap at the inlet that directs the suction towards the cargo space when the vehicle is stationary.

According to the invention, there is provided a positive pressure vent (10) for a vehicle (12). The vent (10) includes an inlet chamber (14) having an air intake port (16) facing into an air stream generated by motion of the vehicle (12) so as to collect air and form a positive pressure inside the inlet chamber (14). There is further provided a filter (18) adapted to filter air from the inlet chamber (14) of particulate matter. A filtered air path (25) is further provided for allowing filtered air from the filter (18) to travel to the interior of the vehicle (12) under the urging of the positive pressure from the inlet chamber (14).