IMPROVING VENTILATION AND IAQ
ANSI/ASHRAE STD 62.1 & OVERHEAD HEATING
2000 16 200 0.8 250
Zone floor area (ft 2 ) Zone population (people) Breathing zone outdoor airflow (cfm) Typical zone air distribution eectiveness (E z )* Outdoor air intake flow (cfm)
2000 16
Ventilation Effectiveness When supply and return vents are located at the ceiling, it’s often difficult to distribute the supplied air throughout a space and to the occupied zone. This issue can be further exacerbated in heavily obstructed spaces such as office cubical zones and industrial facilities and is worst in winter heating modes when IAQ
200 1.0** 200
*Table 6.2.2.2 of ASHRAE Standard 62.1-2013 **Must be approved by local code ocial *Table 6-4 of ASHRAE Standard 62.1-2019
250
200
concerns are at their peak. How Do Big Ass Fans Help?
200
250
200 (-20%)
50
Big Ass fans can improve zone air distribution effectiveness by pushing supply air down to occupant level, helping to deliver 20 percent more fresh air to the occupant level, or enabling the reduction of fresh air intake by 20 percent without a negative effect on indoor air quality (IAQ). Big Ass fans provide air circulation that also enables what we affectionately call “solution by dilution” where fans reduce the local concentrations of pollutants in stagnant areas or near the source while using the entire indoor air volume as an effective buffer for any pollutant and improving the access of existing ventilation systems.
200
200
E z = 0.8
E z = 1.0
POWERFOIL ® SERIES
(+20%) 250
“BIG ASS FANS TIE NICELY INTO THE UNIVERSITY’S GREEN INITIATIVES. THEY ELIMINATED THE STUFFY SPOTS THAT PLAGUED OUR NATATORIUM AND PUSHED CHLORINE-LADEN AIR THROUGH THE VENTILATION SYSTEM, CREATING A HEALTHIER ATMOSPHERE FOR SWIMMERS AND SPECTATORS.” JIM HEFFEL Aquatics and Safety Coordinator George Mason University Fairfax, Virginia
Without circulating fans (left), HVAC systems and other ventilation equipment can struggle to distribute supply air and to maintain acceptable IAQ. The addition of circulating fans (right) allows for a reduction in outdoor air ventilation rate without impacts to IAQ (top) or can enable more outdoor air to reach the occupied zone, improving IAQ (bottom)
8 | bigassfans.com/contact-us
866.242.9142 | 9
Made with FlippingBook Annual report maker