Thermal displacement room airflow, with low level, high induction mixed flow supply for rapid discharge velocity and temperature differential decay into the occupancy microclimate. Displacement airflow spreads gently across the floor. Heat and contaminants rise by natural convection in thermal plumes to stratify at a high level. Enhanced levels of indoor air quality are attained in the breathing zone.
Air supply from the floor, typically at least 900 mm from seated occupants.
VAV dependent throw
Suitable for VAV applications with limited turn-down. Throw height is dependent upon airflow rate.
Airflow rate is user-adjustable.
Circular face shape
200 mm nominal diameter round swirl face, plus mounting flange.
Radial face pattern
Radially aligned swirl slots provide high induction swirl discharge.
Polycarbonate, dyed matt black, similar to RAL9005. Other colours available on request subject to order size.
The HARMONY Floor Swirl Diffuser, type FSD, is a vertical discharge polycarbonate floor swirl diffuser with vertical discharge and user-adjustable airflow rate from 100% to one of a multitude of preset stops (30%, 35%, 40%, 45% or 50%). Airflow adjustment is by means of rotating the diffuser face. The diffuser is suitable for use in pressurised access floor air distribution systems.
A rapid mount assembly feature provides quick and easy installation or relocation without the need for tools or for access from below.
When cooling, high induction vertical swirl discharge produces intense discharge velocity decay and rapid supply-to-room air temperature equalisation with throw restricted to head height of seated occupants. Cool supply air gently descends to spread as displacement airflow across the floor. An occupancy micro-climate of enhanced indoor air quality is created in which convective currents from occupants and other heat sources rise upwards in thermal displacement plumes. Heat and contaminants stratify in conentrated form at a high level, where they are removed from the space. High levels of indoor air quality and comfort are achieved.
Due to stratification of heat, relatively large supply-to-return temperature differentials are achievable – dependent upon ceiling height – despite the relatively high supply air temperature (typically 18°C), thereby minimising fan energy. Energy savings also accrue from the extended free cooling range often achieved by the elevated supply air temperature, as well as from the potential to reduce outdoor airflow rates due to the enhanced indoor air quality of the occupancy micro-climate.
High induction floor level discharge ensures extremely effective heating performance, due to cool room air, which pools above the floor, being scavanged by the diffuser’s high aspiration, whilst thorough mixing diffuses the warm supply air into the occupancy space.