WINDBAR D91 4.4V ultra slim names one hardware envelope and one published peak voltage. The exterior is 20 mm wide, 82 mm tall, and 10 mm thick. Those three numbers are marked CAD confirmed on the D91 campaign. The front aspect ratio derived from that envelope is 4.10 : 1. Ultra slim in this query is the 10 mm thickness, not a poetic word for “small.” A device can be short and still thick; D91 is the opposite pattern: taller than D95, thinner at 10 mm, narrower at 20 mm.
The 4.4 V figure is peak flavor drive from the product brief, not a claim that every puff is locked at 4.4 V in every market. It is the voltage headroom WINDBAR publishes for this silhouette. Five character editions share the same envelope: Transformative Teal, Blue Aura, Plum Noir, Cobalt Pulse, and Piano Black. Finish art does not change 20 × 82 × 10 mm. If a photo looks thicker, the file is the wrong crop. Google Images should be fed complete 3:4 catalog frames, not the 4:1 wrap strips used as in-page decoration.
What is not locked on the same brief must stay unknown in this article. Battery capacity is not a finished production number here; the campaign lists an engineering range and says internal capacity, coil, and power remain estimates until production documents or lab testing confirm them. Do not write a mAh as if it were printed on the carton. Coil module size, air inlet equivalent, chimney diameter, and activation pressure appear as engineering estimates on the campaign. This URL does not promote those estimates as certificates.
Exterior construction on the CAD block is three closed solids: main housing envelope 20 × 64 × 10 mm, oil-cup envelope 20 × 32.7 × 10 mm, and mouthpiece envelope 19.871 × 17 × 9.9 mm. Those inner envelopes explain why the device can stay 10 mm thick while still having a distinct mouthpiece. They are CAD, not a refill diagram. D91 is presented as a closed character edition, not as a rebuildable box.
WINDBAR D91 4.4V ultra slim is for adults 21+ where the product is lawful. Campaign creative is adult-only. This page is not medical advice and not a license to use nicotine.
