P-700 central-gasket uPVC window
Product photo 
Product photo 
Product photo 
System cross-section
Photos are illustrative and not necessarily this exact system.
uPVC-steel · No. 03
Our most insulated uPVC window.
NFRC certified · U-factor from 0.15 · Central gasket
P-700 is a central-gasket system. Besides the seals at the inside and outside faces, a third gasket sits in the middle of the frame, splitting the gap between sash and frame into two chambers. Water and wind stop at the outer zone. The hardware lives in the dry, warm zone inside. It's the uPVC design European builders use for very low-energy houses, and the system is passive-house-suitable in some configurations.
What does a central gasket do?
Think of it as a second door inside the door. The outer seal sheds most rain. The center gasket stops what gets past it and blocks air. Behind it, the locking hardware stays dry and clean, which helps it keep working smoothly.
Three versions
- P-700: the standard six-chamber, 82.5 mm frame.
- P-700 Light: a lower sash profile for more glass and a slimmer look.
- P-700 Cladded: aluminum cladding on the outside. You get a uPVC frame's insulation with an aluminum face outside and no plastic visible from the street.
When a client wants Passive House numbers but not an aluminum budget, P-700 is where we start.
Built for big, colored units
Glass bonding to the sash (a dry-bonding method on this system, per product data) stiffens the sash. That lets larger colored units stay square and reduces how often they need adjusting. It's a good fit for large tilt-and-turn sashes in dark colors, which work harder in summer sun.
Who should choose P-700?
Passive House and Pretty Good House projects that want uPVC. Homes near traffic, where the center seal helps. Remodels where the HOA or architect wants aluminum outside: choose the clad version. If you need the absolute lowest frame U-factor, also look at MB-104 Pro and our Passive House windows page.
P-700 specifications
Why choose it: central gasket keeps hardware dry · best insulation in our uPVC range · aluminum-clad option.
Trade-offs: costs more than P-300 · the aluminum-clad version adds cost.
Specifications
Performance
- U-factor
- from 0.15 Btu/h·ft²·°F
- SHGC
- 0.17–0.42
- Sound reduction
- up to 45 dB (European Rw)
- NFRC rating
- Certified
- Passive House
- Passive-house-suitable in some configurations; not a PHI certification
Construction
- Frame depth
- 3-1/4″ (82.5 mm)
- Chambers
- 6
- Gaskets
- up to 3, including center gasket
- Glass thickness
- up to 56 mm
Options
- Variants
- P-700, P-700 Light, P-700 Cladded (aluminum exterior)
- Opening types
- Tilt-and-turn, fixed, tilt-only, balcony doors
- Colors
- White, colors and woodgrain foils; ask for the current palette
Ordering
- Lead time
- 3–4 months; made to order and shipped by sea freight
- Warranty
- 20-year limited manufacturer warranty; 3-year installation warranty. See warranty terms
More P-700 views
Product photos and renders; colors and details vary by order.
P-300 · P-500 · MasterLine 10 Elite (aluminum for passive builds)
Is P-700 NFRC certified?
Is P-700 a Passive House certified window?
What's the difference between a central-gasket and a stop-gasket window?
Can I get aluminum outside and white inside?
Building for very low energy?
Send us your energy model targets or PHPP inputs. We'll match systems and glass to them.