CADEXAIR STADIUM Series, Руководство по эксплуатации и обслуживанию

Страница: 15 / 24

For calculations in imperial units, use air velocity units in feet per minute and use the effective
area value in square feet (SQ.FT) for a flow rate in cubic feet per minute (CFM). For calculations
in metric units, use air velocity units in meters per hour and use the effective area value in square
meters (SQ.M) for a flow rate in cubic meters per hour. To convert a flow rate from cubic meters
per hour to liters per second, multiply it by 0.278.
Before balancing the exhaust system, it is important to
check that the filters are installed and adjusted according to
the instructions on the label (see Appendix 3). It is also
recommended to start the exhaust fan and check its
rotational direction before starting airflow balancing.
Finally, it is essential to know the required flow rates to
ensure the hood operates properly.
Take 3 velocity readings in the filter slots according to the
image below. Measurements should be taken perpendicular
to the top of the filters at a distance of approximately 2"
(50mm). Calculate an average velocity per filter by adding
the 3 average velocity values and dividing by 3.
Then, multiply the mean velocity obtained by the effective area factor according to the filter’s
size.
SIZE EFFECTIVE AREA
H x W (IN) SQ . FT SQ . M
16 x 16 0,431 0,040
16 x 20 0,542 0,050
16 x 25 0,681 0,053
20 x 16 0,431 0,040
20 x 20 0,542 0,050
20 x 25 0,681 0,053
13