Key Factors to Select a Bag Filter Housing

Bag filter housings are workhorses in many industries, silently removing unwanted particles from liquids and gases. But with various options available, selecting the right housing can feel overwhelming. Don’t worry, this guide will unveil the key factors to consider for a smooth and efficient filtration process. 

Consider the Following Factors Before Choosing a Bag Filter Housing

Understand Filtration Needs and Uses

Contaminants: What kind of particles are you trying to filter? Dust, sediment, or something else? Knowing the size and type of contaminants will help determine the micron rating (filtration efficiency) of the filter bags you’ll need.

Flow Rate: How much liquid or gas needs to be filtered per unit time? This will influence the size and number of filter bags required, and ultimately, the size of the housing itself.

Compatibility: The housing material and filter bags should be compatible with the process fluid you’re filtering. For example, corrosive chemicals might require a stainless steel housing and specially designed filter bags.

Choosing the Right Material for the Job

Bag filter housings come in various materials, each with its strengths:

  • Stainless Steel: The go-to choice for durability and resistance to high temperatures and pressure. Ideal for harsh environments and corrosive liquids.
  • Carbon Steel: A cost-effective option for non-corrosive applications. However, it’s susceptible to rust and may not withstand high pressures.
  • Thermoplastics: Lightweight and often budget-friendly, suitable for low-pressure applications and non-corrosive fluids. Popular options include polypropylene (PP) and polyethylene (PE).

Design and Configuration of Bag Filter Housing

Beyond materials, consider the housing’s design and configuration for optimal use in your space:

  • Entry/Exit Points: Top-entry housings offer easy access for bag changes, while side-entry housings might be better suited for limited overhead space.
  • Number of Bags: Single-bag housings are ideal for lower flow rates, while multi-bag housings can handle larger volumes.
  • In-line vs. Portable: In-line housings integrate directly into piping systems, while portable housings are more versatile and can be moved around.

Ensuring Easy Operation and Maintenance

  • Quick-Opening Closures: Look for closures that allow for fast and easy bag changes, minimizing downtime.
  • Safety Features: Pressure relief valves and proper venting are crucial for safe operation.
  • Additional Features: Consider features like sight glasses for monitoring filter saturation and drain ports for easy disposal of filtered contaminants.

Cost and Certifications

While upfront cost is important, remember that high-quality bag filter housing can save money in the long run through durability and efficient filtration. Consider factors like:

  • Replacement Bag Costs: The cost and frequency of replacing filter bags can significantly impact your total filtration expenses.
  • Certifications: If your application has specific regulatory requirements, ensure the housing meets relevant certifications like ASME (American Society of Mechanical Engineers).


By considering these key factors – filtration needs, material compatibility, design features, and ease of use – you’ll be well on your way to selecting the perfect bag filter housing for your application. Remember, consulting with a filtration expert can provide valuable insights for a smooth and efficient filtration process. With the right housing in place, you can ensure cleaner operations and a healthier bottom line.

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