Environmental Filtration Specialists
Industrial Air Filtration

Industrial Air Filtration

The extensive industrial air filtration products from EFS have been designed to meet increasingly stringent global regulations and to safeguard plant air quality. Based on our extensive knowledge and experience, our products include bag and cartridge filter media suitable for a broad range of air flows, dust loads, particle sizes and applications.

The product range has been designed to offer the customer unrivalled operational flexibility, including the option of circular or square housings and top or side access for filter media changing, to suit process requirements or space limitations.

Project Management & Engineering Services

Our staff of Project Managers adheres to a step by step process that is centered on providing the highest level of customer satisfaction.

We believe in providing continual communication while working with you from initial design, through start up and commissioning to ongoing product support. As part of our Project Management program we offer a wide range of engineering services that facilitate the optimum air filtration design and installation.

  • Engineering surveys
  • Dust collector & fan sizing
  • Ductwork sizing & layout
  • Explosion protection recommendations
  • Project quotation
  • Project management
  • Turn-key installation
  • Installation supervision
  • Start-up & commissioning
  • Recommended spare parts list
  • Service

Technical guidelines to help your filtration ststem

What is an AIR-TO-CLOTH ratio and how do I calculate it?

Also referred to as an air-to-media ratio, an air-to-cloth ratio quantifies the amount of air going through one square foot of filter media. It is often used as a simple way to state the ratio between CFM and square feet of filter area.

For example, if a dust collector was moving 4,000 CFM and had 2,000 ft² of filter area, we could say that it had a 4,000-to-2,000 ratio. This can be simplified to a 2:1 air-to-cloth ratio. So, to calculate an air-to-cloth ratio for a dust collector, we take the amount of airflow (CFM) and divide it by the amount of filter area within a dust collector.

Why is it important?

It is one of the more important factors in determining how long a filter will last in a given application. Although there are many factors that come into play when determining filter life, air-to-cloth ratios can give good guidance when determining the size of dust collector required for a given amount of air. A lower air-to-cloth ratio will result in longer filter life and is often used in nuisance applications, while a higher air-to-cloth ratio will result in shorter filter life and is often used when dust loading is very light.

Industrial Air Filtration Experts In Scotland

Our years of experience in the industry and our expert professional air filtration engineers make us the first choice for commercial dust control.

Still got a question?




Poor filter cleaning can be the result of undersized or restricted cleaning system components. It is important to make sure that there are not any restrictions starting from the compressor all the way to the reservoir. Also, ensure that your header tank size matches your cleaning requirements.

Ensure better cleaning with tanks that are kept free of moisture and debris as they can substantially impact the ability to clean the filters.

The pulsing frequency can never be any faster than the reservoir can recover to full pulsing pressure

The pulse sequence should be adjusted to ensure that newly cleaned filters do not take in dust from the neighboring filter being pulsed. Staggering the firing order helps reduce cross-contamination

Project Management & Engineering Services

Perhaps the most important indication of a dust collector’s performance is the differential pressure (resistance of air across the filters and clean air plenum). This measurement gives you an indication of whether your filters are operating correctly. Based on your system(s), the collector(s) should have been designed to operate within a set range of resistance, (measured in inches of water column). The differential pressure reading will indicate whether there is an issue with too low of a differential pressure (typically meaning the filters are allowing too much air to pass through which usually means emissions as well), or too high of a delta P (meaning flow is being restricted and will lead to reduced system flow capabilities and ultimately lower manufacturing capacity).

Our experts and field specialists recommend a proactive maintenance program where you are monitoring and trending how differential pressure is performing. In regards to critical process collectors, this should be done daily, and in regards to nuisance collection collectors – at least once a week. Upon seeing a negative trend, you can immediately start to evaluate potential problems with the process- are my cleaning systems operating properly? Are their leaks in the duct work causing outside air to be pulled in? Is material building up in the hopper causing erratic inlet flow distribution? Are my pick-up points balanced correctly to obtain the proper draft? Simply put, interpreting your pressure drop is like monitoring your blood pressure, and when done proactively, you can address potential problems before they cause serious plant production or emission issues