500m³ Commercial Aroma Diffuser-Waterless Cold-Air Scenting for Hotels, Malls & Retail

Where the K28 sits in the RAMOND commercial range

The K28 is the tall floor-column model of the RAMOND K series, covering the 500 m³ class with touch control as standard. The same waterless cold-air platform runs across the whole commercial line — rated coverage spans 150–4000 m³ across the range — so the K28 is the right starting point when one unit per zone fits your floor plan. Two notes for longer shortlists: if scent must ride central air handling instead of standing in the room, the sheet-metal K31S and K51S models are the ones built for HVAC duct connection; and if your rollout prefers phone-based operation, the family adds Bluetooth app control on +S models and Wi-Fi app control on +Pro models.

• Waterless pump-pressure diffusion — dry air, no daily water routine, no visible mist

• 500 m³ coverage class with a 280 ml tank and a 2.6 ml/h continuous oil draw

• 80 cm aluminium floor column in four finishes: dark green, black, gold, silver

• Touch-panel interval scheduling; Bluetooth and Wi-Fi versions available elsewhere in the range

How much space does one K28 cover?

One K28 covers up to 500 m³ — at the typical commercial ceiling height of 2.8–3 m, that converts to roughly 170–180 m² of floor area: a mid-size hotel lobby, a flagship store, a generous restaurant floor or a wellness club reception. Two siting conditions shape how the rating plays out: open, free-moving air distributes scent more evenly than partitioned rooms, and strongly extract-ventilated spaces usually call for a higher output setting or a second unit for the far zone. If you are sizing bigger rooms or open plans, our guide to choosing a scent diffuser for large spaces walks through the sizing logic step by step. For larger floors, several K28 units can work zone by zone — each keeps its own tank and schedule.

Does it need water? Pump-pressure vs ultrasonic

The K28 scents the air by pump-pressure atomization — a two-fluid, cold-air method that breaks pure fragrance oil into a dry, fine dispersion. Because no water enters the loop, there is no tank to top up daily, no humidity settling onto furniture, electronics or merchandising, and no cool-mist plume rising from the unit. For a buyer, the difference shows up in two places: upkeep shifts from a daily water routine to an oil refill measured in weeks or months (table below), and the area around the unit — garments, displays, stock — stays dry. One condition to plan around: the K28 runs on oil-based specialist fragrance oils, not water-soluble oils; the matched oil programme is listed further down the page.

What does installation involve?

The K28 is placed, not installed. It stands 80 cm tall on an 11 × 11 cm footprint — a furniture decision, not a fit-out task. Set it along a wall, beside reception seating or at the edge of a display zone, plug it into a standard outlet and fill the 280 ml tank. No ducting, no drilling, no fixed installation — and when the layout changes, the unit moves with it. A standard placement checklist:

• Footprint 11 × 11 cm, height 80 cm — plan the spot as you would a floor lamp

• Adapter cord length 1.5 m — keep the spot within reach of an outlet

• Power input 5 V DC / 2 A / 10 W via the supplied power cord

• Tank 280 ml, filled with oil-based specialist fragrance oil

If the project calls for scent delivered through central air handling instead, the sheet-metal K51S is the model in this range built for duct connection. Our guide on how to install an HVAC scent diffuser covers how a ducted setup works in practice — and our team can advise which route suits the site once they see the floor plan.

How long does one tank of oil last?

One fill lasts from about 48 days (A4, the densest setting) to about 177 days (A1, the gentlest) — measured from the current model range. Under the hood, continuous output is 2.6 ml/h (0.00075 ml/s): the K28's four interval settings trade scent intensity for refill length, and the table below shows the measured cycles.

Refill-cycle settings (measured, current model range)

Which setting suits a site depends on footfall, door traffic and how dense the scent field should read. Longer intervals suit continuous background scenting; shorter intervals suit peak hours or feature zones. Send your floor plan and opening hours with the inquiry and our team will help you choose the setting and plan the refill rhythm around your housekeeping schedule.

How is it controlled day to day?

Day-to-day operation runs on the touch panel: set the working interval once around your opening hours and the K28 follows the schedule on its own. That makes it a standalone unit — no app pairing, no network setup, nothing extra for staff to learn, which matters where several sites share one small facilities team. If your rollout does prefer phone-based control, the K series also comes in Bluetooth (+S) and Wi-Fi (+Pro) versions; browse the commercial scent diffusers range or ask our team which control level fits your sites.

Where does the K28 fit best?

The K28 fits best in four kinds of commercial interior — hotels, retail floors, club and café spaces, and salon treatment rooms. Paper covered; the notes below connect each space to the features above.

• Hotels & serviced apartments：A steady background scent from lobby through corridor keeps the arrival experience consistent for every guest. Refill cycles measured in months (48–177 days by setting) mean housekeeping adds the K28 to a routine rather than a daily checklist.

• Shopping malls & boutiques：Slim columns tuck along walls and beside fitting zones, scenting retail areas without humidity near garments, displays or stock — dry dispersion is where this technology earns its place in merchandised space.

• Internet cafés & clubs：Long opening hours are exactly what the interval settings are for: set the schedule once around the day plan and the machine runs unattended, with touch control reserved for occasional adjustments.

• Beauty salons & spas：Dry, low-profile diffusion keeps treatment rooms presentable — no mist, no moisture, no visible water tank competing with the calm the space is selling.

Specifications

What ships with it, and which oils does it run on?

Each K28 ships with the machine itself, a power cord, an accessory kit and the user manual — everything a standard floor placement needs. For multi-unit orders, packing stays simple: four units per carton, carton size 35 × 35 × 92 cm, 11.6 kg per carton.

The K28 runs on oil-based specialist fragrance oils. The RAMOND oil programme covers 12 specifications and 61 fragrance profiles, so the scent can be matched to the brand and the space instead of settled for — browse the single essential oils and essential oil blends, or see how the pieces fit together in our commercial scenting solutions.

FAQ

Can I arrange a sample unit first?

Sample units are usually the first step for bulk projects. Send your space size and timeline through our contact page and our team will confirm the current sample arrangement; OEM and branding requirements are covered under our aroma diffuser custom services.

What are the MOQ and lead times?

MOQ and production lead time depend on the model configuration and order volume, so we quote them per project rather than quoting ballpark numbers. Share your project scale in the inquiry and the quotation will carry the exact figures for your order.

Is the unit certified?

The K28 ships as a certified unit — our quality and technology page outlines the approach behind it. For the documentation that applies to your market, ask together with your quotation and our team will confirm which certificates are current and share them.

What warranty applies?

Warranty terms are confirmed per order and per market, so the terms you receive match the units you order. Request the warranty schedule together with your quotation.

Pump-pressure or ultrasonic — which diffuser type should I choose?

As a general principle, ultrasonic diffusers vibrate a water-and-oil mixture into a visible cool mist — they add humidity to the air and need regular water top-ups. The K28 works on pump-pressure atomization with pure oil alone: dry, invisible dispersion, no water logistics for your team, and no humidity settling near garments, electronics or finishes. For commercial interiors with merchandise or sensitive materials in the scent zone, that difference usually decides the choice; match the atomization method to the space and to the upkeep your team can carry.

What makes RAMOND different from other diffuser manufacturers?

We would rather hand you comparison checks than slogans. Compare candidates on the points that shape a commercial purchase: the atomization method (the K28 uses waterless pump-pressure cold diffusion), the build (an 80 cm aluminium floor column offered in four finishes), runtime transparency (measured refill cycles published for every output setting, A1 through A4), the design (the K28's design is patented), and oil supply (a programme of 12 specifications and 61 fragrance profiles to match your brand). Then judge the quotation itself: exact MOQ, lead time and warranty figures for your market, confirmed in writing.

Plan the K28 into your space