HVAC Calculation
Powered by
Solver360
HVAC Load Calculator
All Solvers
Blog
Air Filter Efficiency Calculator
Back to All Solvers
Back
Input Parameters
Unit System
Imperial (°F, BTU, ft)
SI (°C, kW, m)
Upstream Particles (particles/m³)
Downstream Particles (particles/m³)
Pressure Drop (in WG)
Calculate
Results
Filter Efficiency
90
Efficiency %
18
MERV Rating
1
Pressure Drop in WG
Air Filter Efficiency Calculation Theory
Click to expand theory section
Calculation Steps
1
Calculate Filter Efficiency
Formula:
η
=
N
u
p
s
t
r
e
a
m
−
N
d
o
w
n
s
t
r
e
a
m
N
u
p
s
t
r
e
a
m
×
100
\eta = \frac{N_{upstream} - N_{downstream}}{N_{upstream}} \times 100
η
=
N
u
p
s
t
re
am
N
u
p
s
t
re
am
−
N
d
o
w
n
s
t
re
am
×
100
Calculation:
η
=
1000
−
100
1000
×
100
\eta = \frac{1000 - 100}{1000} \times 100
η
=
1000
1000
−
100
×
100
Result:
90.00 \text{ %}
