Selective Glass – Guardian Sun

Panes · Types Of Glass Panes

Guardian Sun works in both directions: in winter the low-emissivity coating keeps heat in, and in summer the selective layer turns solar energy away before the room overheats. From the outside it still looks like ordinary glass.

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two options to choose from

daylight still comes through

UV blocked, laminated

The specification

The details worth knowing

The system

available in 39 and 35 (g) variants natural look of classic glass low-emissivity glass — reduces heat loss in winter selective glass — reduces the heat entering the interior in summer in the laminated version blocks over 90% of UV radiation, protecting people and furnishings suits homes, offices and public buildings in practically any insulated unit

Where it earns its keep

large south- or west-facing glazing that overheats by the afternoon rooms where you want the daylight but not the heat — kitchens, garden rooms, sliding systems interiors where flooring, furniture or artwork is fading; the laminated version stops over 90% of UV anywhere the view matters — colours and shapes through the glass stay true, with no tint to look past

Two options

Guardian Sun 39 or Guardian Sun 35

The number is the g-value — the share of the sun’s heat the pane lets through, so the lower number is the cooler glass. Selectivity (S) is daylight divided by that heat: the higher it is, the more light you keep for every degree you keep out. Both options reach 0.5 W/m²K in a triple-glazed unit, and both look like ordinary glass.

Guardian Sun 39

The brighter of the two. A double silver coating turns solar heat back outside while 71% of the daylight still comes through — the one to pick when the room has to stay light.

Visible light (Lt)

Solar heat let in (g)

Selectivity (S)

U-value

Guardian Sun 35

The cooler of the two. The same coating tuned a step further: 35% of the sun’s heat gets in instead of 39%, for the large glazing that overheats, at the cost of one percent of daylight.

Visible light (Lt)

Solar heat let in (g)

Selectivity (S)

U-value

Talk to us

Not sure which glass you need?

Tell us the room, the window and what the glass has to deal with — noise, a low sun, a ground-floor window — and we will say what we would fit.

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Call 07447 706111