How to Brief a Contractor on a Filter Problem in a Warehouse or Workshop

If you have a filter problem in a warehouse or workshop, the site visit goes better when you can describe what is happening in plain, practical terms. Contractors do not just need to know that the air system is “not working properly” — they need to understand the dust load, the equipment type, how the filters are accessed and what symptoms you can see or hear.

A good brief saves time on site, helps the contractor arrive with the right parts or tools, and reduces the chance of a second visit. It also helps if you are comparing options for our products, filter servicing or commercial filter servicing.

Start with the equipment and where it is located

Begin by identifying what the contractor is dealing with. In industrial and workshop settings, “the filter” could mean several different things, so being specific matters.

Include:

• •the type of system, such as roof-mounted supply air units, wall-mounted extract systems, dust collectors, spray booth filtration, make-up air units or portable filtration units
• •the make and model if you have it
• •where the equipment sits on site, including building, bay, level or access point
• •whether the unit is indoors, outdoors or on a roof
• •whether the system serves one room, a workshop zone or a larger warehouse area

If you have the manuals or asset records, have them ready. Even a photo of the rating plate can help the contractor identify the correct filter size, frame style and access method.

If you are not sure how to describe the filter size or frame, our guide on how to measure an air filter can help before the visit.

Describe the dust load and what is in the air

Contractors need to understand the type of contamination the filter is dealing with. Dust in a warehouse is not the same as smoke, welding fume, timber dust, food dust or general workshop dirt, and that changes the way the system should be assessed.

Be ready to explain:

• •what is being produced on site, such as cardboard dust, packaging lint, grinding dust, sanding dust, flour, timber fines, overspray or smoke particles
• •whether the dust is dry, sticky, oily or damp
• •whether the contamination is constant or only happens during certain tasks
• •whether the system is dealing with large visible particles, fine dust, or a mix of both
• •whether there are odours, even if the filters appear physically intact

It is also useful to note any recent changes. For example, the problem may have started after a change in production, a new process, a higher dust load, a door left open more often, or a nearby building activity.

If there is any mould present, mention it clearly. Do not try to clean or disturb it yourself if that would expose staff to more dust or debris.

Explain the symptoms in practical terms

The contractor will usually want to know what has changed. Try to describe the symptoms rather than guessing the cause.

Useful details include:

• •reduced airflow at grilles, hoods or supply points
• •visible dust escaping from the system or settling more quickly than usual
• •unusual noise, rattling or whistling from the unit
• •a rise in pressure drop where gauges are fitted
• •filters that look loaded, collapsed, torn, wet or damaged
• •leak paths around the frame or housing
• •odours that were not previously noticeable
• •equipment cycling more often or struggling to maintain normal operation

If the issue is intermittent, say when it happens. For example, it may only occur when several machines are running, when dock doors are open, or during certain shifts.

Try to avoid broad statements like “the filters are blocked”. A better brief is: “The pressure gauge is reading higher than normal, the supply air has dropped off at the end of the line, and the filter face has visible dust build-up.”

Describe access, safety and site constraints

Access is one of the biggest reasons a simple job becomes complicated. The contractor should know what they will need to bring and how long it may take to reach the equipment.

Tell them:

• •whether the unit is at floor level, above a machine line, on a mezzanine or on a roof
• •if ladders, elevated work platforms, fall protection or permits are needed
• •whether there are height restrictions, narrow aisles or locked plant rooms
• •if the unit can be isolated without stopping production
• •whether after-hours access is required
• •if there are dust hazards, confined spaces, hot work restrictions or other site rules

If filters are difficult to remove, say so. A contractor may need extra hands, lifting gear or a different access plan if the filter housing is awkward or compact.

If the building is part of a broader ventilation system, it can also help to check the site requirements with the mechanical services engineer or building owner, particularly where AS 1668.2:2024 is relevant to the ventilation arrangement.

Give the filter details that matter

When you can, note the basic filter information already on site. You do not need to use technical jargon if you do not know it, but a few details make a big difference.

Include:

• •filter dimensions, if known
• •the filter type, such as panel, pleated, bag, pocket, cartridge or pre-filter
• •whether the filter is disposable or a specific reusable type
• •the frame material, if visible
• •whether there are seals, gaskets or retaining clips
• •whether the filter is original equipment or a previous substitute
• •whether the unit uses staged filtration with pre-filters and finer filters downstream

If you are unsure about the grade or class, do not guess. In Australia, older EN 779 classes such as G3, G4 and F5 to F9 are still commonly referenced, but they do not convert directly to MERV or ISO 16890 ratings. A contractor or filter supplier should check the exact specification for the equipment and site conditions.

For specialised applications, some sites use HEPA filtration. If that is relevant, it is worth stating whether the system is designed for H13 or H14 performance, since those ratings have specific efficiency definitions under EN 1822.

Make the inspection easier for everyone

A short pre-visit note or phone call can prevent confusion. The best briefs are simple, specific and grounded in what is actually happening on site.

A helpful message might include:

• •the site address and best entry point
• •contact person and mobile number
• •equipment type and location
• •the visible symptoms
• •what dust or fumes are present
• •any access limits or safety requirements
• •whether photos can be sent before the visit

Photos are especially useful if the unit is hard to reach. A clear shot of the housing, the filter face, the gauges and the surrounding access path can help the contractor plan the job before arriving.

If you are not sure whether the issue is a filter problem or something else in the system, a site walk-through with a contractor or filter supplier can save time. It is also a good moment to check whether the current filters are the right fit for the equipment and the dust conditions.

When to involve a filter supplier

A contractor can assess the system, but a filter supplier can help match the right replacement to the application. That is especially useful where you need a non-standard size, a custom frame, a specialty media blend or a filter for a difficult operating environment.

Some filters are designed to be washable - check the product instructions before reusing anything. For many industrial sites, the better option is to replace a loaded or damaged filter rather than try to clean it without clear guidance.

If you want help matching the filter to the equipment, you can also look at custom air filters or speak with a supplier who understands industrial and workshop applications.

Ready to brief your contractor?

A clear description of the equipment, dust load, access and symptoms helps your contractor arrive prepared and inspect the right parts of the system. It also makes it easier to decide whether you need a standard replacement, a custom solution or a servicing plan that suits the site.

Total Air Filtration, a family-owned air filter manufacturer and supplier in Hillcrest, Brisbane QLD, can help supply or make the right filters for your application. Call 07 3800 3448 or request a quote. If you would like to talk through the job before the site visit, please contact us.