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Air Volume Measurements
Air Volume (CFM / MM) measurements require that the area of the duct or other enclosure
be known. The meter can calculate the area of rectangular and circular ducts or the user
can calculate the area and enter it manually. See details below:
1.
Measure (in inches) the diameter of a circular duct or the length/width of a
rectangular duct. Optional: Calculate the duct area.
2.
Press F1
MEAS
3.
Press F2
INPUT
4.
If the area (in square inches) has been manually calculated, press AREA and enter
the value using the numeric keypad; Press ENTER, then proceed to step 6.
Otherwise continue with step 5.
5.
For rectangular ducts, press
of the duct (using the numeric keypad). Press
width. Press
ENTER
(diameter) key. Enter the duct's diameter (in inches) using the numeric keypad and
then press ENTER.
6.
Take an air velocity measurement as previously described.
7.
Read the CFM or CMM Air Volume measurement on the LCD.
from the WELCOME screen.
softkey.
LxW
(length x width) and enter the length (in inches)
after the width is programmed. For circular ducts, press the
6
ENTER
and do the same for the
Model 451181 Version 2.3 04/06
D
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