faq

A HVLS (High Volume Low Speed) fan is a very large ceiling fan with diameter from10-24 feet long. A HVLS fan moves large volumes of air because of it’s blade length and design.

HVLS fansbreak up the moist aire and accelerate evaporation to produce a cooling effect. The Serco ATEC’s airfoil style blade design produces a massive, cylindrical column of air that flows down to the floor and outward in all directions, creating a horizontal floor jet that consistently circulates air in large spaces. This ‘horizontal floor jet’ pushes air a greater distance before it is pulled back vertically toward the blades. The greater the down flow, the greater the air circulation and resulting benefits.

Because they cover more area, the save money over having many smaller ceiling fans.

In the colder months, fans can be run in reverse to circulate the hot air trapped at ceiling level known as ‘destratification’, pushing the warm air back down to the lower levels, and reduces heat loss through the ceiling.

We offer professional custom installation, so that the fans can work with your HVAC system.

An HVLS fan is a high-volume, low-speed ceiling fan designed to move a large column of air at relatively low rotational speed. It is commonly used in factories, warehouses, logistics centers, gyms, retail buildings, and other large spaces where many small high-speed fans would create uneven airflow. For a site review, show the proposed blade plane on a section drawing and mark where floor-level air speed would be checked during commissioning. Performance depends on ceiling height, obstructions, exposure, building use, and the air-speed target in the occupied zone. An HVLS fan circulates air through a large space; it does not refrigerate the building or remove moisture by itself.

The blades push a broad column of air toward the floor. The air then spreads outward, rises near walls or open boundaries, and recirculates through the space. This large, slow-moving airflow creates more uniform air movement than a narrow high-speed jet. Roof shape, mounting height, nearby walls, racks, and large openings can distort that pattern, so a catalog airflow illustration should never be treated as a site guarantee. For a site review, use smoke visualization only as a qualitative aid; record air speed at repeatable grid points for a quantitative check. An HVLS fan circulates air through a large space; it does not refrigerate the building or remove moisture by itself.

An HVLS fan moves a large volume of air over a wide area at low speed, while a conventional floor, wall, or drum fan usually produces a faster and narrower airflow. HVLS fans are better suited to whole-space air circulation; smaller fans are useful for targeted cooling at individual workstations. An HVLS unit is selected for slower, wider circulation across a large occupied area. The comparison should include the number of units, total system power, noise at relevant positions, maintenance access, and obstruction risk. For a site review, compare two layouts against the same occupied area and air-speed criterion instead of comparing fan diameter or motor watts in isolation.

An HVLS fan does not refrigerate the air. It improves air movement, which can increase evaporative cooling on people and make the space feel more comfortable. Any claimed change in perceived temperature should state the test conditions, humidity, air speed, clothing, and activity level. Air movement can increase heat loss from skin and change perceived comfort, but it does not provide refrigeration. Dry-bulb temperature may become more uniform through mixing, and a sensor can read differently after stratification is reduced; neither effect proves that the fan has cooled the air mass. For a site review, log dry-bulb temperature and air speed separately at occupied height before and after startup, using the same doors and HVAC state.

Yes. An HVLS fan can help distribute conditioned air more evenly and reduce hot or cold zones. Actual HVAC energy savings depend on the building, climate, thermostat strategy, operating hours, and fan layout, so savings should be modeled for each project rather than promised as a fixed percentage. An HVLS fan can complement air conditioning by distributing conditioned air and allowing a carefully tested control adjustment. Any energy result should state the control sequence and baseline period. For a site review, run a monitored trial with comparable weather and production conditions before changing the permanent thermostat or fan schedule.

Yes, if the fan and controller support low-speed reverse operation. Gentle reverse airflow can reduce temperature stratification by mixing warm ceiling air with cooler air near the occupied zone without creating an uncomfortable draft. In heating season, a low-speed mixing strategy can return warm ceiling air toward the occupied zone. The correct setting is the lowest speed that reduces the vertical temperature difference without creating unwanted draft. Reverse mode is model-dependent and should not be assumed to be required. For a site review, place temperature loggers near the floor and below the roof, then compare the vertical gradient at several fan speeds.