Fabric filter bags are designed for use in pulse-jet style baghouses and these filter bags require internal support structures referred to as cages. The purpose of a baghouse cage is to provide the support needed for filter bags to stay open during the dust collection cycle.
The type of cage you have will depend on the design of your baghouse; top or bottom load. If you have a top load baghouse , your top construction is a rolled flange top. If you have a bottom load baghouse, your top construction is a split collar top. Besides the top configuration, there are multiple variations and options for cage construction. Below are some of the most common features and configurations for baghouse cages.
- Rolled Flange Top also referred to as a “Turned Down Flange”. Can come with or without a venturi – Most common for top load baghouses
- Split Collar – Most common for bottom load baghouses
- Split Ring
- Rolled Flange with Handle
The purpose of a venturi is to help speed up the air being pulsed through the bag. It acts like a turbo booster and ensures a proper clean with an efficient sonic ripple. The most common venturi size is a 6” depth, and will normally come welded to the cage. Typically the longer the bag, the more important it will be to have a venturi.
- Welded Pan – Most Common. Each vertical wire is welded to the bottom of the pan.
- Crimped – Wires are crimped over the bottom of the pan.
- Galvanized Steel – Most common
- Mild/Carbon Steel
- 304 Stainless Steel*
- 316 Stainless Steel*
- Titanium – Best for highly corrosive applications
* A good option if your application consists of moisture or chemical conditions that create an environment corrosive to metal.
The number of vertical wires on your baghouse cage will depend on the type of filter bag media you are using. For a felt bag, you will usually have a 10 or 12 vertical wire cage. For a woven bag, you will commonly see a 20 vertical wire cage. For example, fiberglass bags typically use 20 vertical wire cages since the media is flexible and requires more support.
Ring spacing is used to support the vertical wires. Ring spacing is typically 8” but can also be as small as 4”.
Coatings such as epoxy can be applied to baghouse cages and are commonly used for corrosive environments.
Two-Piece Baghouse Cage
Two piece baghouse cages are used in dust collectors that facilitate the use of long bag technology. Two piece baghouse cages are often used when bag lengths exceed 150” and go all the way up to 300” in length. This style of cage is sectioned off in the middle creating two separate parts. They can be linked together with following connection types:
- Finger connection
- Slide Lock 2 Punch
- Slide Lock 1 Punch
- Twist Lok ™
Baghouse Cage Resources
For additional resources on filter bag media, construction , and air-to-cloth ratio you can access our filter bag eBook below.
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