Sizing air purifiers for a TCM clinic's dispensing counter

Key takeaways

• The dispensing counter typically generates stronger, more concentrated odour than consultation rooms
• Size the counter area independently rather than folding it into a whole-clinic estimate
• The CADR formula still applies: floor area multiplied by ceiling height multiplied by target air changes
• Place the unit close to where herbs are actively weighed and packed, not just anywhere behind the counter
• A combined shopfront approach can work for very small, fully open layouts

Why the dispensing counter is usually the strongest odour source

Traditional Chinese medicine clinics commonly weigh, measure and pack a wide range of dried herbs, roots and other ingredients at a dedicated dispensing counter, often within view of waiting patients. This process releases a strong, distinctive herbal smell, sometimes described as earthy or medicinal, that's noticeably stronger right at the counter than elsewhere in the clinic.

Unlike a consultation room where odour is generally milder and less continuous, the dispensing counter can see repeated activity throughout the day as different prescriptions are prepared, meaning the odour source is essentially always active during business hours rather than occasional.

This makes the counter a genuinely different sizing case from a consultation room, and treating it as just another part of the general shopfront often underestimates how much filtration that specific spot actually needs. Staff who work behind the counter daily are usually the first to notice when the smell has built up beyond what feels normal.

Sizing the counter separately from consultation rooms

If your dispensing counter is in an open area shared with the waiting or retail section, measure that combined open area as one zone. If it's in a semi-enclosed nook or behind a partial partition, it's often worth sizing it as its own smaller zone specifically because of the concentrated odour source, even if air technically flows into the wider shop.

Consultation rooms, by contrast, can usually be sized on the general clinic recommendation without needing the same odour-focused adjustment, since their air quality concern is closer to a typical consult room than an active preparation area.

This distinction matters because a single whole-clinic average calculation can leave the dispensing counter under-served even while technically meeting an average target across the whole floor area.

Applying the CADR formula to a compact retail-style counter

The formula stays the same: required CADR in cubic metres per hour equals the counter zone's floor area in square metres, multiplied by ceiling height in metres, multiplied by your target air changes per hour. Given the concentrated odour source, it's reasonable to aim toward the higher end of the commercial range for this specific zone.

Most dispensing counter areas are compact enough to fall within our Fillo Plus, covering up to 30 square metres, unless your counter sits within an unusually large open shopfront.

Our air purifier size calculator applies this formula directly once you enter the counter zone's measurements, which is a faster and more accurate starting point than an estimate. Keep the measurement for the counter separate from any figure you calculate for a consultation room, since combining them into one average defeats the purpose of sizing them apart in the first place.

Placement near where herbs are weighed and packed

Position the unit as close as practical to the actual weighing and packing activity, not simply somewhere convenient behind the counter. The closer the intake sits to where odour is generated, the more effectively it captures that concentrated smell before it spreads to the rest of the shopfront.

Avoid placing the unit where it would be knocked or where its airflow blows loose herb material around during active packing, since that creates a practical mess alongside the air quality goal. A stable spot slightly off to the side of the main work surface usually works better than directly behind where staff stand.

Check the placement with staff who actually work the counter daily, since they'll notice quickly if airflow interferes with their packing process.

When to treat the whole shopfront as one zone instead

For a very small, fully open clinic where the dispensing counter, waiting area and shopfront are essentially one continuous space with no partitions at all, it can make more sense to size and treat the whole area as a single zone rather than trying to isolate the counter artificially.

This is a judgement call based on your specific layout, and a room-by-room survey is the most reliable way to decide which approach genuinely fits your clinic rather than applying a general rule that may not match your floor plan. A clinic that has recently renovated or moved counters is a good candidate for revisiting this decision, since the old sizing assumption may no longer match the new layout.

Next step

Start with our air purifier size calculator for your dispensing counter's dimensions, then request a free Air Report if your layout is more complex than a simple open shopfront.

Frequently asked

Why is the dispensing counter usually the main odour source in a TCM clinic?

Weighing, measuring and packing herbal ingredients releases a strong, distinctive smell that's concentrated right at the counter and repeats throughout the day as different prescriptions are prepared, unlike the milder, less continuous odour in consultation rooms.

Should the counter be sized separately from consultation rooms?

Generally yes, particularly if it's a semi-enclosed nook, because a whole-clinic average calculation can leave a concentrated odour source under-served even while technically meeting an average target across the whole floor area.

When does it make sense to treat the whole shopfront as one zone?

For a very small, fully open layout with no partitions between the counter, waiting area and shopfront, treating the whole space as one combined zone can be more practical than isolating the counter artificially.

Related reading

• Why Your Clinic Smells — and How to Fix It