Domestic technical textiles Industry Segment-wise consumption of ...

Filtration efficiency: Filtration efficiency can be calculated using the following formula
Filter Efficiency = 1 - Particles Downstream
Particles Upstream
MERV Rating or Minimum Efficiency Reporting Value is a number from 1 to 16 that is relative to an
air filter’s efficiency. The higher the MERV, the more efficient the air filter is. A higher MERV
creates more resistance to airflow because the filter media becomes denser as efficiency increases.
The table below gives the application areas of various types of filters.
Filter Efficiency MERV ratings Application
95% >14
Final filter in hospital and other clean
room HVAC systems.
85% >13
Commercial applications like research
Labs.
65% >11
Standard commercial buildings, such as
office space.
25% >6
Pleated panel filters, used in office
environments, and as prefilters.
10 Pre filter
5 to 10 Medium efficiency filters
< 5 High efficiency filters
The filter media should have appropriate anti static properties to prevent build up of static charge due
to dust particles which can lead to an explosion.
The pre filters are generally re-usable as they can be washed when the filter medium gets choked. The
HEPA filters on the other hand are disposable type.
Market dynamics and key growth drivers
The demand for HVAC filters is derived from the demand of HVAC systems. The HVAC industry
can be broadly classified into the following two segments:
Split and window type air conditioners