Quiet Fan Blades for HVAC Systems

Fan and air conditioner with reduced noise compared to conventional designs by using a folded structure at the fan inlet to smoothly transition airflow into the guide. The fan has a flow guiding device with a current collector, throat, and diffuser. The inlet end of the collector has a flange structure with an angled folded edge to pre-guide airflow. This avoids abrupt changes and noise from sudden speed and direction changes.

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Blower design with a diffuser to convert the direction of airflow discharged by the fan into ascending airflow. This allows the blower to efficiently move air vertically without needing a separate upward fan or ducting. The diffuser extends vertically from the fan outlet and guides the air upward. It reduces noise and flow separation compared to conventional rising airflow generators. The diffuser shape and angles are optimized to balance noise reduction and efficiency.

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Reducing the rotational inertia of impellers in fans and air conditioners to improve stability and reduce noise. The fan design involves mounting the impeller on both ends instead of just one. This reduces the moment of inertia compared to traditional fans where the impeller is suspended from one end. The impeller has a first connection point to the motor mounting plate and a second connection point to the housing. This configuration reduces the weight at one end and lowers the overall rotational inertia. The air conditioner incorporates this fan design inside the second housing.

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Air conditioner indoor unit with improved airflow and reduced noise compared to conventional units. The unit has a cross flow wind wheel, air guide blades at the outlet, and blocking ribs on the connecting rod. The ribs prevent air from reversing and causing discontinuous backflow at the outlet. This eliminates surge noise and improves user experience. The ribs form rectangular plates extending along the blade width. They connect outward from the rod and prevent airflow reversal at the outlet.

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A fan and air conditioner design with improved airflow and reduced noise compared to conventional designs. The fan has a two-section volute tongue that steps in height. The first section extends along the air duct opening and the second section extends from the end of the first section. This smooths the airflow transition and reduces vortex formation compared to a single tongue. The air conditioner has a matching stepped volute tongue in the duct cover and seat. This joint configuration improves airflow in the duct and reduces noise compared to conventional ducts.

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Cross-flow wind wheel for air conditioner indoor units that reduces noise compared to conventional wind wheels. The wind wheel has sections of sub-impellers connected by a middle section with hollow cavities and sound absorption holes. The cavities and holes reduce noise generated by the wind wheel during operation. The cavities utilize noise produced by the wind wheel and the holes provide fine sound absorption. This improves noise reduction compared to solid sections.

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A cross-flow fan blade for air conditioners that reduces airflow separation and loss by stabilizing the airflow passing over the blade. The blade has a rectifying protrusion that extends out from the back of the blade. This protrusion creates a rectification effect on the airflow, preventing radial movement and reducing separation as the blade rotates. The protrusion is shaped like a fish fin and starts at the thickest part of the blade. This stabilizes the airflow as it passes over the blade, reducing separation and loss compared to a smooth back blade.

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Fan structure for air conditioners that reduces noise compared to conventional designs. The fan has a volute cover and seat that form communicating inner and outer air channels. The cover has a first tongue extending into the outer channel. The seat has a second tongue against the cover tongue. The first tongue width is 1/2 to 8/9 the cover width, angle 2-5 degrees, and equal length to the seat tongue. This prevents vortexes and noise compared to spiral volutes. The seat width is 1/9 to 1/2 the cover width. The first and second air outlet sections have equal horizontal length. The first volute tongue width is the duct width, larger than the seat tongue. This configuration prevents vortices and reduces noise compared to spiral volutes.

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Reducing noise from air conditioner fan blades by controlling airflow. The noise reduction structure for an air outlet device of an air conditioner includes fan blades and a heat exchanger. The heat exchanger has gaps between adjacent components. Instead of having small gaps, the gaps are made larger. This reduces the airflow velocity through the gaps compared to smaller gaps. The slower airflow exiting the gaps impacts the fan blades at a lower velocity, decreasing blade noise.

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Air conditioner indoor unit with improved blade design to reduce vibration and noise. The indoor unit has a rotatable blade at the outlet to control airflow. The blade is connected to a motor that generates rotational force. The blade also has a material with restoring force. A buffer member connects the blade and transmission to balance the blade when the unit is not perfectly level. This prevents blade vibration and noise when rotating.

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Air conditioning unit with reduced noise from fan blades passing and lid fasteners. The unit has an air inlet, fan, control box with lid, and flange to fasten the lid. A flow straightening part covers the flange to smooth airflow around it and prevent turbulence that causes blade passing noise. This reduces the unpleasant NZ sound generated by the fan blades passing the flange area.

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Fan assembly for an air conditioner that reduces external noise without adding sound insulation layers or extra components. The fan assembly has a two-stage fan configuration with a fan blade at the inlet and another fan blade in the duct near the outlet. The blade at the inlet has a shallower camber (less curved) at the leading edge than the blade further in the duct. This accelerates and pressurizes the airflow as it passes through, increasing exhaust capacity without adding devices like mufflers or sound insulation.

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A reversible axial fan for decentralized ventilation systems that reduces noise and improves pressure stability compared to conventional axial fans. The fan blades have a sinusoidal shape with specific curvature and angle extension on both leading and trailing edges. This profiling reduces tonal noise compared to conventional flat blades while maintaining good airflow. The sinusoidal shape also improves pressure stability compared to conventional fans, especially at low speeds.

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Fan device and air conditioning outdoor unit that reduces noise and improves airflow performance compared to conventional designs. The fan has two axially arranged wheels with supports at least on their sides or between them, instead of a bracket that can affect airflow. This avoids interference between the wheels and allows optimal flow. The wheels have equal or greater distances between opposite sides. The outlet side is enclosed and farther from the wheels than a threshold. This prevents vortices and noise. A tapered sleeve surrounds the wheels and connects to the housing. The sleeve has equal sections and gradually decreasing sections.

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Reducing air conditioner noise by dynamically adjusting the shape of the volute component near the fan blades. The volute component has a sawtooth piece that can move relative to the main body. When the sawtooth piece overlaps the main body, the volute has a smooth surface. When staggered, it has sawtooth teeth. The sawtooth piece is driven by a transmission assembly to convert between smooth and sawtooth shapes. This allows optimizing the volute shape for different airflow conditions to reduce noise. Additionally, a moving assembly adjusts the volute-fan distance.

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Centrifugal fan design to reduce noise compared to conventional fans. The fan has a volute shape with a variable gap between the blade tip and the volute tongue. The gap decreases along the blade height towards the volute outlet. This reduces periodic peak noise caused by the blade impacting the volute tongue. The fan can be used in air conditioning systems with multiple fans to further reduce noise by aligning their volute bodies.

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Intelligent ventilation and noise reduction system for equipment like fans, cooling systems, and boilers. It uses sensors, communication, controllers, and processors to optimize heat dissipation, ventilation, and noise control. The system monitors indoor temperature, noise levels, and other environmental parameters. It automatically adjusts fan speed, blade angles, and silencer positions based on real-time data. This improves noise reduction, prevents overheating, and saves energy compared to fixed solutions.

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Air conditioner design to reduce noise and vibration from the motor to the fan blades. The key innovation is placing a damper between the motor and fan blades. The damper absorbs vibrations from the motor before they reach the blades, preventing excessive noise and wear. The damper is made of weaker material than the motor shaft to allow vibration absorption. It also has sequential weakening of the connector and damper strength to maximize vibration absorption. The damper is connected to the blades using links with couplings that support the damper to prevent distortion. This improves durability and prevents damage to the blades.

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Indoor unit for air conditioners that improves airflow performance and reduces noise. The indoor unit has a duct with opposing walls and a fan inside. The fan diameter, duct outlet length, and width have specific relationships. This limits fan size based on outlet dimensions. It allows optimizing fan size for duct dimensions to improve airflow and reduce noise compared to arbitrary fan sizes. The relationships are: d = a*L2 - b*L2 = 2 - c (fan diameter vs outlet length) and d = a1 - e*a1^3 + f = 2 + g (fan diameter vs outlet width) with a=2.85-2.95, b=1.51e-3-1.61e-3, c=1241.3-1261.3, e=6.05-6.

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Indoor unit and air conditioning system design to improve airflow and reduce noise from the air outlet of the indoor unit. The design involves optimizing the fan diameter, air outlet length, and width based on specific relations to achieve better airflow and lower noise. The indoor unit has an air duct with opposing walls and an air outlet. The fan diameter D, outlet length L2, and width a1 are related by a formula: d = a*L2 + b*a1 + c. The constants a, b, and c have specific ranges. This limits the fan size based on the outlet dimensions for better matching and performance.

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Air conditioner with a cross-flow fan that improves fan performance and reduces noise by using adjustable guide vanes. The fan is mounted in an air duct with a volute tongue. Rotatable guide vanes on the volute tongue guide the air flow through the duct. By adjusting the guide vane angles, the fan's air inlet angle can be changed to control the attack angle on the fan blades in the vortex area. This reduces flow separation, improves fan efficiency, reduces noise, and allows different flow rates at varying speeds.

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A blower design for electrical appliances like air conditioners that improves airflow and reduces noise compared to conventional designs. The blower has a scroll-shaped case with a movable leading edge that adjusts the gap between the case and the fan blades. This allows changing the air inlet area and volume. It also has a vortex throat leading-in section with multiple angles matched to different flow rates. This reduces discrete vortices and noise compared to fixed throat shapes.

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A cross-flow fan with improved efficiency, noise reduction, and reliability compared to conventional cross-flow fans. The fan has a fixed impeller, a swingable air duct, and a separate swingable flow guiding device. The impeller, duct, and guiding device do not rotate together. This allows the duct and guiding device to swing independently to change the fan's airflow direction without requiring as much force. The fixed impeller reduces vortex formation, noise, and airflow recirculation.

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Reducing fan noise in HVAC systems by using an acoustic shroud around the fan blades. The shroud has an inner wall inside the outer wall. An acoustic damping material is sandwiched between the walls. The inner wall is permeable to air flow. The shroud encircles the fan blades to attenuate noise as the fan spins. The inner wall allows air to pass through while the damping material absorbs vibrations and sound.

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Fan structure for air conditioners that reduces noise compared to conventional axial flow fans. The fan has a rotatable housing with openings on the side walls. Inside the housing, noise reduction structures with bending channels are arranged. The blades are mounted on the outer wall of the housing. When the housing rotates, wind is generated. Noise from the blades enters the openings and propagates through the bending channels. This causes interaction and scattering of the noise, reducing overall noise levels.

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Air conditioner indoor unit with a mechanism to sweep the air outlet without blocking it when not needed. The unit has a wind sweeping mechanism at the air outlet with a blade that can move between positions facing and away from the outlet. When air sweeping is needed, the blade faces the outlet. When not needed, the blade folds back against the unit to avoid obstructing the airflow. This improves air quantity and reduces noise compared to fixed blade designs.

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Air conditioner design with a cross-flow fan to minimize noise and stabilize airflow. The air conditioner has an intake at the bottom, a case with an upper discharge port, and a blowing fan between them. The fan is offset radially from the rotation axis. Guides on either side of the fan between the fan and discharge port channel the airflow. This prevents fan-generated swirls from interfering with the discharge path and reduces noise. The guides also have longer central sections facing the fan to improve airflow stability.

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Fan blade design for air conditioners that reduces noise and improves airflow efficiency. The fan blade has an inclined plane on the side edge that helps redirect airflow and reduces resistance when the blade rotates. This improves airflow efficiency and reduces noise compared to traditional fan blades. The inclined plane is arranged on the side edge of at least part of the fan blade.

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An indoor unit for an air conditioner that prevents reverse airflow and improves efficiency compared to traditional cross-flow fans. The fan design has shorter blades on the end sections facing the side walls, and longer blades in the middle. This prevents air from reversing into the unit through the gaps between the fan and side walls. The shorter blades provide enough energy to prevent reverse suction while the longer blades provide enough volume. This prevents reverse airflow, reduces noise, and prevents scattering of water droplets.

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Fan, air conditioner outdoor unit and air conditioning system with improved noise reduction and efficiency compared to conventional fans. The fan blades have teeth that are raised towards the windward and/or leeward sides. This uneven tooth design better adapts to uneven incoming airflow, prevents boundary layer separation, and reduces broadband noise compared to flat teeth. The teeth also allow camber line changes without blade distortion. The fan can have multiple stages driven by a single motor with opposing rotation. The fan is also used in an air conditioner outdoor unit to further reduce noise. The teeth improve compatibility with non-fan components.

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Reducing noise in a ceiling air conditioner by replacing the centrifugal fan with multiple cross-flow fans. The cross-flow fans are arranged in separate cavities in the rear cover. Each fan is driven by a separate motor mounted in the motor casing between the fan cavities. This reduces noise compared to a single centrifugal fan. The motor casing also provides structural support between the water pan and rear cover.

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An indoor unit for air conditioners that reduces noise and improves performance by optimizing airflow through the unit. The indoor unit has a through-flow fan, air duct, inlet grille, and heat exchanger. The heat exchanger shape, position, and angles are configured to match airflow speeds between the fan inlet and duct. This prevents vortexes and flow mismatches that cause noise. The heat exchanger has straight sections with intersecting extensions. The fan inlet angle is larger than the other side's angle. This ensures faster airflow at the heat exchanger end facing the fan to match fan requirements, while slower airflow on the other side. This avoids flow speed mismatches and vortexes.

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Air handling unit (AHU) with a fan design that reduces noise levels across the fan speed range. The fan has a stator ring with a smooth, levelled surface that encircles the back plate. The stator ring and back plate form a flow guide for the air that aids in achieving a desired flow with less noise and energy losses. The ring and back plate have different shapes to provide a guiding surface for the air flow. This flow guidance reduces noise compared to conventional fans with flat back plates.

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An air conditioner with a cross-flow fan that reduces backflow and noise when the outlet opening is small. The fan has a guide part between the fan and the outlet duct. The guide part prevents air from re-entering the fan and backflowing when the outlet opening is narrow. It also prevents vibration and noise. The guide part height should be 3-6 mm. This avoids excessive duct resistance and inadequate backflow prevention.

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Air conditioner with a blade support design to reduce deformation and noise in the blade. The blade is driven by a motor at one end, and the other end is supported by a blade holder that can rotate. A spring or elastic member applies torque to the blade holder. A case surrounds the blade holder and accommodates the spring. A stopper inside the case limits the rotation range of the blade holder to prevent excessive bending. This controlled rotation of the blade holder reduces blade deformation and noise compared to unsupported blades.

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Indoor unit for air conditioners with optimized airflow and reduced noise. The indoor unit has an air duct with opposing walls and a through-flow fan blade. The fan blade length, air outlet length, and width have specific proportions: l1 = a*L2 - b*a1 + c, with a=1.15883, b=1.45414, c=41.16452, and l1 > L2 > a1. This limits the fan blade and outlet sizes relative to each other to improve airflow efficiency and reduce noise.

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A modular duct fan system for air handling applications like HVAC that allows customization of airflow characteristics and noise reduction. The system consists of interchangeable components like adjustable long throw outlet nozzles, speed controllers, silencers, and regenerable filters that can be combined in different configurations to optimize airflow and noise performance for specific applications. The modular design enables flexibility in designing customized air handling systems with tailored airflow and noise characteristics.

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An air conditioner with a quiet cross-flow fan design to reduce noise levels. The fan has 14-30 impellers arranged with displaced blades between adjacent impellers and connected together without gaps. The impellers are short, compact cylinders with diameters less than 150mm. They are positioned close to the heat exchanger, less than 20% of the impeller diameter, with an inverted V-shape. This configuration reduces the 2NZ and 3NZ fan noises compared to conventional fan designs.

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A linear bar diffuser blade for HVAC systems with an undulated leading edge that reduces pressure drop and noise compared to traditional smooth blades. The blade has a wave-like contour along its length on the leading edge. This undulated shape reduces impact on airflow velocity and pressure compared to a smooth leading edge. The wave-like contour also extends into the blade width. This undulated surface enhancement improves airflow performance and reduces noise when the blade faces the incoming air stream in the diffuser.

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A diffuser blade for HVAC systems that reduces airflow pressure drop and noise compared to traditional blades. The blade has an undulated contour along the leading edge that extends into and out of the blade width. This contour reduces the impact of the blade on airflow velocity and pressure profiles as it enters the conditioned space. The undulated shape also reduces noise compared to traditional smooth blades. The blade is made of sheet metal for cost effectiveness.

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Air conditioning indoor unit design to suppress blade passing frequency noise generated by crossflow fans. The design involves an end cover with wider gaps on the outer side of the fan blades compared to the inner side. This prevents airflow inhibition when the end cover faces the fan blades. The wider gap on the outer side allows airflow from the fan blades to exit without restriction, reducing the chance of indoor air entering the fan and generating noise. The gap on the inner side is narrower to prevent air bypassing the fan blades. The outer gap width is wider than the inner gap width.

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A cross-flow fan for air conditioners that reduces noise compared to conventional cross-flow fans. The fan has multiple swinging blades attached to a rotating gear that connects to a fixed disc. The blades swing relative to the disc as it rotates. This allows the blade motion to be decoupled from the disc rotation, reducing noise compared to fixed blades. The blades swing in a limited range using openings in the disc.

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A supply air device for building ventilation that can regulate air flow with minimal noise generation. The device has a valve mechanism with a sliding throttle that restricts airflow. The valve has a first tube with a layer of porous material on the inside to reduce noise. This porous layer is thicker at the initial length of the tube and thinner at the subsequent length. This gradual thickness change helps prevent airflow separation and noise. The sliding throttle has a second tube that telescopes inside the first tube. The second tube has an open end and a sound-eliminating sleeve that engages the air inlet when the valve closes. The sleeve helps further reduce noise. A friction-suppressing and dust-rejecting protection layer is provided on the porous layer to prevent damage.

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Reducing noise in air conditioners by using a special blade design in the fan. The blade has a gradual thickness reduction from the hub to the blade tip. This prevents blade deformation and vibration when the blade encounters pressure from the airflow. The gradual thickness transition allows the blade to flex slightly without deforming or swinging excessively. The smooth transition of the blade also helps integrate the airflow better, resulting in more uniform airflow from the fan and lower noise.

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Cross-flow fan for air conditioners that reduces noise and improves airflow efficiency. The fan has an impeller with an internal cavity divided into multiple air channels by a flow guide structure. This channeling directs the airflow path within the impeller, preventing vortices and uneven velocities. The guided airflow exits the impeller with more consistent velocity and pressure. This reduces noise compared to traditional impellers with unguided airflow. The fan is used in air conditioners to improve airflow characteristics and reduce noise compared to conventional fans.

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Reducing noise and vibration in air conditioner blowers using a specific blade connection method. The blower fan blades are connected through a connecting member that extends between the outer edge of one blade and the inner edge of the adjacent blade. This connection bridges the gap between the blade tips to prevent blade tip fluttering that can cause noise and vibration. The blades still rotate independently around their axis but are connected at the outer edges to prevent tip flutter.

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A compact centrifugal fan for air conditioners that provides higher airflow volume while reducing noise. The fan is used in window air conditioners to improve air supply performance in smaller units. The fan design features a unique impeller shape with curved blades that increase airflow without increasing noise compared to conventional impeller shapes. The fan is integrated into a compact window air conditioner to provide higher airflow volumes in a smaller unit size.

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A heat exchange assembly for air conditioning systems that reduces noise compared to conventional designs. The assembly has a circular heat exchanger with a central fan enclosed in its hollow interior. This configuration allows the fan to blow air axially through the exchanger instead of perpendicularly like in conventional setups. This reduces noise because the airflow is more aligned with the fins instead of hitting them at an angle. The circular shape also allows maximizing fin area for heat exchange.

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Indoor unit for vertical air conditioners that provides low noise, high air volume and 360-degree air supply. The unit uses a laminar flow fan above the evaporator to convert heated air into streamlined laminar air flow. An axial flow fan below directs lower cavity air upwards. This configuration avoids the air bending and losses of centrifugal fans. The laminar flow fan's low noise, high pressure, and uniform airflow improve user experience. The axial fan boosts laminar air supply.

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Wall-mounted air conditioner indoor unit with reduced noise, higher air volume, and uniform airflow. The unit uses a laminar flow fan positioned in front of the evaporator to blow out laminar air through the outlet. This reduces noise compared to cross-flow fans. The laminar flow fan has annular disks with gradually reduced diameters and increasing spacing. It connects to the evaporator with a gap between the fan and front panel. This allows laminar air to flow out without turbulence. The laminar fan provides high volume and pressure air with low noise and uniform flow.

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