This invention provides a natural ventilator that is free of moving parts, wind-activated, rain-proof, and not only suitable to be a standalone natural ventilator but also advantageous to be used as an enhanced exhaust exit in a forced-air ventilation system. It can also be used as a suction generator that supplies so-called suction or negative pressure to help stabilize such building components as roof membranes by channeling the low pressure to its underneath to balance the wind uplift above.

The ventilator includes a hollow base body to be secured onto an exterior surface of such enclosed objects as a building or vehicle and having a convex upper face, and a hollow raised body being supported and secured on the base body with elongated hollow members and having a convex lower face towards the base body. The elongated hollow members establish conduits that channel the internal spaces of the hollow base and raised bodies. A free space is formed between the convex faces of the base and raised bodies. Each of the said convex faces has an opening, at or near their centers and substantially facing each other. The said convex faces of the base and raised bodies are configured in such a way that the free space between the convex faces is generally narrower near the openings than away from them. This forms a first contracting and then expanding path for airflow to approach from any direction and to pass through the free space between the said convex faces, providing a venturi mechanism. The device thus creates low pressure in the free space near the openings and hence a suction effect therein, which can be readily communicated to any interior space of a building or vehicle needing air relief or suction and to be properly connected with the hollow base body.

A series of enhanced rainwater-proof designs are illustrated to exemplify methods of defending the system against rainwater invasion, even if raindrop trajectory becomes highly oblique from vertical as driven by strong winds.

Present embodiments provide a roof fan assembly with numerous improvements. The roof fan assembly includes a cover which allows for a fan shroud to be opened. The structure includes a base clamp which connects to the roof of an RV. The base clamp includes a fan and motor which push or pull air out from the RV or into the RV. The base clamp includes a worm gear assembly which includes a worm gear structure to open and close the shroud. The arm may include a sleeve which moves relative to the arm and connects to the shroud at the opposite end. The base clamp includes mounts for connecting the base clamp to the roof as well as allowing for connection of the cover to the fan assembly as a whole. Still further, the structure provides integrated hinges in the base clamp to allow connection of the shroud to the base clamp for pivotal movement.

A riding vehicle is provided with a downdraft fan assembly mounted on a vehicle roll bar for providing a flow of ambient air over the vehicle operator and a canopy carried by the fan assembly and providing solar and precipitation protection for the operator.

A roof (102) for work vehicle comprises a molded roof portion (200) formed by rotational molding, the molded roof portion (200) having a first surface (202) that is generally planar and faces upward, and a second surface (300) molded integral with the first surface (202), wherein the second surface (300) faces downward and has a plurality of integrally molded troughs (308, 310) that extend upward into the second surface (300).

A hingeless ventilator comprises a frame defining two openings surrounded by a seating rim, which is surrounded by a door recess. A pair of upright sleeves is disposed between the openings, and each upright sleeve defines an exterior track surface. A door is disposed to face the outer surface of the frame and has a main body configured to be selectively positionable to cover and uncover both of the openings and defines a lip surrounding the periphery thereof and extending generally perpendicularly to the main body. Two door struts connected to the door extend through the frame openings and hold a handle that has rollers that are biased against the exterior track surfaces of the sleeves.

The skylight vent cover is installed immediately beneath the existing skylight in the ceiling of a structure, e.g., motorhomes, cabin boats, etc. The vent cover includes one or more opaque panels that are spaced away from the overlying structure to substantially block light passage while allowing airflow between the panel(s) and overlying structure. Some embodiments have a single planar or non-planar panel. Other embodiments have a plurality of tiered panels. The upper surface(s) of the panel(s) can have a reflective coating thereon to reflect light and heat from the skylight and vent. Various attachments can be provided, e.g., mating hook and loop material, magnets, hinge and latch, etc. In all embodiments, the panel is spaced away from the overlying ceiling structure, and in the case of multiple panel embodiments, the panels are spaced apart from one another to provide good ventilation and airflow therebetween.

A ventilation system for a passenger transit vehicle that comprises a passenger compartment. The ventilation system comprises a variable speed fan for providing outside air to the passenger compartment, wherein within a given ambient temperature range, the speed of the variable speed fan is controlled such that the air speed produced by the variable speed fan increases with increasing ambient temperature. The ventilation system further comprises a duct system fluidly connecting the variable speed fan to an air diffuser that directs the air from the variable speed fan towards the passengers within the passenger compartment. The cross sectional area of the duct system decreases along its length for providing substantially constant air pressure along its length. The ventilation system is able to provide outside air into the passenger compartment at an air flow speed of greater than 0.15 m/s.

A system is presented to prevent harm to occupants of unattended vehicles in warm weather due to the greenhouse effect by circulating ambient air through the vehicle using the blower from the vehicle's air conditioning system powered by a solar cell array and rechargeable batteries, with a thermometer controller to engage and shut off the system at preset high and low temperatures, situated in a recessed area on the roof to minimize drag when the vehicle is moving and avoid detracting from the appearance of the vehicle.

A vent cover for covering an opening in a building structure to vent its interior is provided. The vent cover includes a hollow cover member with an open bottom for positioning over and covering the opening in the building and a front end with an opening. A grill is removably secured in the opening in the front end of the cover member. The grill has a plurality of partitions. Each of the partitions is defined by intersecting members, which have a tapered cross section for accelerating the flow of air through the grill. The grill also has a splash guard and an overhang structure optimal for preventing rain, snow and water from entering the grill and the opening in the building structure. The cover member may be aerodynamically shaped for use atop vehicles such as trailers and RVs.

Provided are a ventilator and a vehicle having the ventilator. The ventilator includes a housing assembly, a fan blade, a first drive device, a cover plate assembly, an air guide sleeve, and a controller. The housing assembly has a first accommodation space and a vent. The fan blade and the first drive device are mounted in the first accommodation space. The first drive device is configured to drive the fan blade to rotate about a rotation axis of the fan blade, and is electrically connected to the controller. The cover plate assembly is provided at a side of the housing assembly. The air guide sleeve is provided between the cover plate assembly and the housing assembly and configured to be lifted or lowered relative to the housing assembly to expose or cover the vent. A second accommodation space is defined by the air guide sleeve and the cover plate assembly.