An interior blind cuts out the light, but the heat is already in: the sun has passed through the glazing and warmed the air in the room. An exterior screen stops the radiation before the glass — according to solar shading manufacturers this is several times more effective than any interior fabric. In summer the air conditioning runs less; in winter, fabric lowered for the night adds a layer of air at the window.
A screen is a fabric curtain on a roller inside an aluminium cassette. It runs down guides or cables alongside the window and does not stop you opening the sash inwards. The fabric is not solid: screens have an openness factor — from 1 % to 5 %, so during the day you can see the street while you are almost invisible from outside, and the room keeps its daylight instead of going dark.
ZiiiP ZIP systems — for windy sites
In an ordinary screen the fabric is held by cables or open guides: in a strong wind it flaps and can pull out of the guides, so the system has to be raised. In a ZIP system (ZiiiP) a welded keder along the fabric edges runs inside the guide like a zip: the fabric is tensioned around the whole perimeter, cannot billow out, and leaves no gaps at the sides — no mosquitoes get in and no light leaks through. ZiiiP 120 covers up to 700 cm of width (coupled curtain), ZiiiP 95 — the compact version for narrow openings, ZiiiP BOX hides under render or within the insulation layer, ZiiiP 160 is designed for the SB450 pergola and an area of up to 16 m².
Cassette systems and marquisolettes
The classic cassette systems are R 125 (height up to 425 cm), R 120, R 103 (width up to 450 cm), R 95, R 90 and the compact R 76. Some of them also work without a motor — with a crank handle. Marquisolettes 120 and 103 are built differently: the top of the fabric is carried forward on a 63 cm bracket, forming a small awning against the high summer sun, while below it the fabric runs vertically and covers the window.
Horizontal Veranda systems
For conservatories, glass roofs and terraces there are horizontal systems: Veranda — up to 450 × 500 cm, and Veranda V ZiiiP with pneumatic fabric tensioning, a structure to PN-EN 13561 and a Somfy io or Cherubini Nemo Blue motor already included in the price.