run forward, blowing air at the floor. When used for destratification in the winter, the fans are run in reverse, blowing air towards ceiling which then circulates around the room. The height at which HVLS fans can be effective is limited compared to axial destratification fans. Benefits of destratification This method has the most benefits through its application in the heating, ventilation, and air conditioning (HVAC) industry and in heating and cooling for buildings and it has been found that "stratification is the single biggest waste of energy in buildings today." For reducing energy consumption By incorporating thermal destratification technology into buildings, energy requirements are reduced as heating systems are no longer over-delivering in order to constantly replace the heat that rises away from the floor area, by redistributing the already heated air from the unoccupied ceiling space back down to floor level, until temperature equalisation is achieved. With regards to cooling destratification systems ensure the cooled air supplied is circulated fully and distributed evenly throughout internal environments, eliminating hot and cold spots and satisfying thermostats for longer periods of time. As a result, destratification technology has great potential for carbon emission reductions due to the reduced energy requirement, and is in turn capable of cutting costs for businesses, sometimes by up to 50%. This is supported by The Carbon Trust which recommends destratification in buildings as one of its top three methods to reduce carbon dioxide emissions. For comfort Destratification naturally increases air movement at the floor, reducing "hot spots" and "cold spots" in a room. It can be used in typically cold areas, like grocery store freezer cases, to warm patrons shopping nearby. In addition, air movement from destratification fans can be used to help meet ASHRAE Standard 62.1 by increasing the amount of air movement at the floor. References External links TECHNOLOGY EVALUATION OF THERMAL DESTRATIFIERS AND OTHER VENTILATION TECHNOLOGIES // Joel C. Hughes, Naval Facilities Engineering Service Center TEMPERATURE PROFILES AND WINTER DESTRATIFICATION ENERGY SAVINGS IMPRESS METAL PACKAGING DESTRATIFICATION CASE STUDY March 2017 Heating, ventilation, and air conditioning Building biology Building engineering