The Xtrem 76 MD system adds a third, central sealing circuit, which makes it perfect for seaside locations. That middle seal forms a "dry chamber" around the hardware, shielding metal components from the corrosive bite of salty coastal air. The result is a markedly longer lifespan for the mechanisms with far less upkeep.
Its six-chamber build delivers superb acoustic insulation, holding back noise from busy streets and tourist districts. If you want to build a calm, energy-efficient retreat, 76 MD stands out as the top pick in the mid-range tier.
Brand
Kömmerling — European leader in PVC profile production with over 125 years of history. Their windows combine German precision with maximum energy efficiency, making them the best choice for projects requiring uncompromising quality.
More about KömmerlingTechnical Specifications
The perfect solution for seaside homes. Its third sealing circuit works as a barrier against salty dust and damp, protecting the hardware from corrosion while also dampening street noise much more effectively.
Core system specifications:
Glazing and infill choices:
Maximum size limits:
Tested performance values:
Documentation
The perfect solution for seaside homes. Its third sealing circuit works as a barrier against salty dust and damp, protecting the hardware from corrosion while also dampening street noise much more effectively.
For a standard 2-sash tilt-and-turn window (1200 × 1400 mm) with basic double-glazed unit.
Alternative solutions from other manufacturers
Side by side
How Kömmerling Xtrem 76 MD stacks up against the closest matches from other brands.
| Specification | Kömmerling Xtrem 76 MDThis profile | Schüco LivIng 82 | WDS 76 MD (76 mm) | Rehau Geneo |
|---|---|---|---|---|
| Brand | Kömmerling | Schüco | WDS | REHAU |
| Material | PVC | PVC | PVC | PVC |
| Profile depth | 76 mm | 82mm | 76mm | 86mm |
| Chambers | — | 7 chambers | 6 chambers | 6 chambers |
| Glass unit, max | up to 50 mm | up to 52mm | up to 48mm | up to 53mm |
| Thermal (Uw) | ≤ 0.8 | 0.8 | 0.92 | 0.85 |
| Sound (Rw, dB) | ≈ 47 Rw(dB) | ≈47 Rw(dB) | ≈45 Rw(dB) | ≈50 Rw(dB) |
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FAQs
It is a 76 mm build-in depth, 6-chamber PVC profile with a triple-circuit (MD) seal arrangement. The defining element is a highly elastic central seal that splits the rebate into two zones, creating a "dry chamber" for the hardware. The frame achieves Uf = 1.0 W/m²K, and the material is Xtrem PVC carrying Greenline certification.
The third sealing circuit forms a "dry chamber" inside the profile that houses the hardware, keeping salt dust and damp away from the metal components so they resist corrosion. This is why the 76 MD is positioned for front-line seafront homes, where standard two-seal systems leave the mechanism more exposed to airborne salt.
The 76 MD accepts insulated glass units up to 50 mm thick. Within that limit you can fit acoustic laminated glass for top-level quiet, or energy-saving assemblies built around a thermal frame, letting the window reach a heat-loss rating of Uw up to 0.73 W/m²K when paired with the right glass.
A single leaf can reach up to 2500 mm tall (with special reinforcement) and up to 1500 mm wide. Beyond those figures the profile is not the right choice. Watertightness is rated Class E900, giving strong defence against driving storm rains, and acoustic dampening reaches up to 48 dB with laminated glass.
The triple-circuit MD seal lifts sound insulation to ≈ 47 Rw(dB), against ≈ 44 Rw(dB) for the dual-seal Xtrem 76 AD on the same 76 mm depth. With acoustic laminated glass the 76 MD can reach up to 48 dB, making it the stronger choice where street, plaza or bar noise is the priority.
The 76 MD delivers Uw ≤ 1.0 W/(m²·K) at its 76 mm depth. If you need lower heat loss, look higher in the range:
