What This Product Actually Is
The core of the design is simple: a rigid header plus a set of sewn pockets. The header (frame) is usually aluminium, galvanised steel or engineering plastic, depending on whether you care more about weight, corrosion resistance or cost. Into that frame we attach several pockets made from non-woven media – typically synthetic or glass fibre, depending on the efficiency and temperature you need.
Compared with a flat panel filter, this type of construction gives a lot more media area in the same face size. That allows you to keep face velocity and pressure drop under control, even when the unit itself is quite compact. For small equipment makers and system integrators, it means you can design the casing first and then have us match a filter to it, rather than designing around a fixed set of standard sizes.
Typical Applications for Compact Pocket Modules
Because these modules are short and rigid, they tend to show up in a few recurring places:
Supply and return sections of small AHUs and rooftop units
01
Fan-coil or make-up air units where there is a little more space than a panel filter, but not enough for a deep bag
02
Air filter sections inside OEM equipment – coating lines, drying cabinets, test chambers and similar machines
03
Ventilation boxes for workshops, welding booths or process areas where finer filtration is needed in a tight space
04
In many of these applications, a standard deep bag filter is physically too long, while a flat filter does not have enough area. This compact pocket format sits between the two and gives more design freedom.
How We Handle Sizing and Customisation
Most enquiries for this product start with a drawing or a photo of an existing filter slot. You tell us the height, width and maximum depth, and we work out how many pockets and how much media area can be fitted without making installation awkward. If you are upgrading an older unit, we also look at the current filter type and operating pressure to avoid surprises.
In many projects, the goal is to take an oversized panel filter or an under-sized pocket and turn it into a well-balanced module. That is where we can quietly design custom filter bags in a way that fits your casing and still runs at a sensible pressure and velocity. For a new machine, we can do this early in your design so that the filter slot, access door and service space are all matched to something realistic.
Construction & Media Options
We keep the construction straightforward, so maintenance crews recognise it immediately when they open a door or panel:
Headers / frames
•Aluminium or galvanised steel for most HVAC and industrial duties
•Rigid plastic frames where weight or corrosion are more critical
Pocket layout
•Typically three to six pockets per module in this compact range
•Pocket depth selected according to your casing depth and required airflow
Media choices
•Synthetic non-woven media for standard temperatures and humidity
•Fibreglass media where higher temperatures or stricter fine-particle control are required
Working with Us as a Long-Term Partner
Our role here is to be the quiet factory behind your projects. Once a design is agreed, we freeze the drawing, media and header specification so that every repeat order behaves like the first one. If you later decide to adjust efficiency class or media type, we treat that as a controlled change, not a random swap.
For brands and equipment makers, this is also where a steady source of custom filter bags under your own label makes life easier. We can follow your part numbering, labelling and packing style, so your warehouse and service teams handle the filters just like any other internal item.
What to Include in Your First Enquiry
To move quickly from idea to a concrete proposal, a short list of details is enough:
Casing opening (height, width) and maximum depth available for the filter
01
Desired efficiency level or reference (e.g. "similar to our existing F7 pockets")
02
Airflow per module or per bank
03
Application (AHU, rooftop, process machine, ventilation box, etc.)
04
Any special conditions: higher temperature, high humidity, space constraints or access limitations
05
With that information we can suggest a module layout, media choice and expected pressure drop, and then price it according to your quantity. If you prefer to test first, we can start with one or two sizes as samples before you roll the design out across multiple units.
In short, if you are tired of forcing your equipment to fit whatever filters happen to be in a catalogue, this range gives you a way to specify the casing you want and let us take care of the filter element design in the background – including the custom filter bags that make the whole assembly work.
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