78
8-5-2. BRANCH DUCT (Installation at site)
To be compatible with both round and rectangular branch ducts, knockout holes are designed to fit to both shapes for flexible
on-site installation.
3. Fresh air intake volume & static pressure characteristics
Q
0
B
A
C
1
Line of chart
Field duct
characteristics
Q
A
EC
2
Q
Qa
AD
3
Q…Designed fresh air intake volume
<m
3
/min>
A…Static pressure loss [Pa] of fresh
air intake duct at airflow rate of Q
B…Required boost pressure [Pa] of
air conditioner inlet at airflow rate
of Q
C…Required static pressure [Pa] of
booster fan at airflow rate of Q
D…Required compensation [Pa] for
static pressure loss of fresh air
intake duct to make airflow rate Q
E…Static pressure [Pa] of indoor unit
at airflow rate of Q
Qa…Estimated fresh air intake
[m
3
/min] without compensation of D
How to read the chart