Start with the location of the moisture
A misted display door is a visibility problem, but the location of the moisture changes the investigation. Record whether it is on the outside face, inside face, frame or apparently between the panes. Note whether it appears after replenishment, during busy periods or after the shop air-conditioning stops. A photograph without that context is a weak basis for specifying a different door.
Condensation can form when a surface is below the dew point of the air touching it. Humidity therefore belongs in the brief alongside room temperature. Copeland's anti-condensate controller documentation illustrates how door heating can respond to dew point and door temperature; it does not establish the controller or performance of a particular MARKOOL cabinet.
Technical references
These sources explain the topic; they are not certification or test evidence for a MARKOOL model.
Compare Low-E, triple glazing and heated glass
These descriptions refer to different design choices and can occur together. Low-E identifies a coating; triple glazing identifies a multi-pane construction; heated glass adds an electrical function. AGC lists low-emissivity glass ranges for commercial refrigeration, but selecting a coating does not establish the performance of the finished door.
Request an assembly drawing and a sample comparison for the proposed options. Pane count alone does not specify coating, cavities, edge construction, frame or seals. A heated option also needs an identified power and control arrangement. Availability must be confirmed for the selected cabinet.
| Option | What to compare | Approval evidence |
|---|---|---|
| Low-E glazing | Coating, pane arrangement, appearance and cleaning requirements | Exact glass specification and visibility under agreed conditions |
| Triple-glazed door | Assembly thickness, weight, frame, hinge and seal compatibility | Complete door drawing and opening/closing check |
| Heated glass or frame | Which areas are heated, power, control and service access | Wiring identity, heater operation and cabinet energy result |
Technical references
These sources explain the topic; they are not certification or test evidence for a MARKOOL model.
Write a visibility test that reflects the placement
For a humid entrance, record the door traffic and nearby outdoor-air exposure. For a bar, include the staff opening pattern and replenishment period. For a shop with overnight air-conditioning shutdown, include that operating period in the proposed check. These are test inputs, not a promise that one glass option covers every site.
Before the sample test, agree where visibility will be observed, the loading, opening schedule and duration, and what counts as an acceptable result. Keep photographs, temperature and humidity readings on one timeline. Record any clearing time after an opening event rather than judging only a freshly closed, unloaded cabinet.
| Record | Buyer input | Supplier response |
|---|---|---|
| Site | Room temperature and relative humidity across a working day | Conditions covered by the proposed configuration |
| Use | Products, loading and door-opening pattern | Sample setup and observation points |
| Result | Required view of labels and product facings | Visibility criteria, exceptions and actual evidence |
| Energy and service | Operating hours and local maintenance needs | Comparable energy data and replacement-door scope |
Keep the door decision connected to branding and service
A glass logo or transparent film changes the viewing area. Ask for an appearance proof on the proposed door construction, with the cooler lit and the intended packs behind it. Identify which cleaning method and treatment are approved, especially where coatings or heating are present.
For an existing cabinet, send the rating-plate identity, photographs and the circumstances of the issue before ordering a replacement. Do not assume visible moisture between panes can be resolved by changing a temperature setting. The applicable service procedure should determine the next inspection. A glass replacement quote should identify the complete assembly and included fittings.
What to send with a condensation enquiry
Send the model or proposed format, destination, cabinet holding requirement, room temperature and humidity, opening pattern, photographs of the moisture location and any store shutdown routine. Ask for a response that separates the proposed door construction, test conditions, energy evidence, price difference and maintenance implications.
Choose the option with evidence relevant to the intended placement. An attractive sample photograph, a Low-E label or an added heater does not by itself demonstrate year-round visibility.
Apply the checklist
Compare doors for your actual placement.
Send the model, room temperature and humidity, opening pattern, product pack and visibility requirement. Ask which door construction and sample checks fit the brief.
Request a glass-door comparison ↗