Dometic S4 1100x450 Sliding Window

A Dometic S4 1100 x 450mm horizontal sliding caravan and motorhome window, with double acrylic glazing, a polyurethane frame, and an integrated fly screen and blackout blind.

Why This Product

If your caravan or motorhome's 1100x450 window has cracked, yellowed, or started leaking around the seal, a genuine Dometic S4 replacement restores a weathertight, insulated opening without having to modify your existing cut-out. It's a well-documented standard size in the Dometic S4 range, so blinds, flyscreens and seals stay available if you ever need spares later. For Western Cape touring, from hot coastal days to cold nights inland, the horizontal slide gets you ventilation without a hinge swinging out over a nearby awning, bed, or bench, and the built-in blind and flyscreen mean you're not sourcing those separately.

Key Features

• Double acrylic glazing set in a polyurethane frame for thermal insulation
• Integrated pleated fly screen for insect protection
• Built-in aluminium-coated darkening/blackout blind, adjustable independently of the flyscreen
• Smooth horizontal sliding sash, needing no swing clearance unlike a hinged window
• Safety catch that prevents the window being opened from outside
• Straightforward installation using the S4's trimmable inner frame

Ideal For

• Replacing a cracked, yellowed, or leaking 1100x450 sliding window of the same nominal size
• A caravan or motorhome renovation where old single-glazed windows are being upgraded
• Owners who want ventilation near a kitchenette, bed, or bench where a hinge's swing would be in the way
• Builders fitting out a new trailer or camper shell to the S4 window standard

Local Support from 4Matt Campers

We stock and supply the Dometic S4 range from our base in Bellville, Cape Town, serving customers across the Western Cape and beyond. Caravan and motorhome window swaps live or die on the cut-out size, so measure your existing opening carefully and contact us to confirm fitment before you order.

Technical Specifications

• Nominal size: 1100 x 450 mm
• Opening type: Sliding (horizontal)
• Glazing: Double acrylic glazing
• Frame material: Polyurethane
• Standard inclusions: Integrated fly screen and built-in darkening/blackout blind
• Wall thickness range (S4 range, typical): Approx. 26-41mm via trimmable inner frame - confirm against your own panel
• Security: Safety catch prevents opening from outside

What's Included

• Dometic S4 1100x450 sliding window unit - polyurethane frame with double acrylic glazing
• Integrated pleated fly screen
• Built-in aluminium-coated darkening/blackout blind

Optional Fitment / Upgrade Notes

The 1100x450 in the title is the Dometic S4's nominal size - always measure your existing cut-out/rough opening and compare it to your current window before ordering, since a mismatch of even a few millimetres means it won't seal. The S4 range is built around a trimmable inner frame that typically covers wall thicknesses from roughly 26mm to 41mm, so check your panel thickness falls in that range. Because the sash slides sideways rather than swinging out, this sliding S4 needs less external clearance than a hinged window of the same size - useful where an awning rail or fitting sits close by.

Complete Your Setup

Renovating more of the caravan? See the rest of our Dometic hinged and sliding window range. · Need seals, catches, or other fittings to go with it? Browse caravan and trailer spares. · Fitting an awning nearby? Check our awning range.

FAQ

Will this fit my caravan's existing window opening?
Only if your cut-out matches the S4 1100x450 frame size - measure your existing opening and contact us to confirm before ordering, as we can't guarantee fitment from the nominal size alone.

Does it come with a flyscreen and blind?
Yes - this Dometic S4 window includes an integrated pleated fly screen and a built-in aluminium-coated darkening/blackout blind, both adjustable independently.

How does the sliding mechanism work?
The sash slides horizontally rather than hinging open, so it needs no outward swing clearance - handy where an awning arm or other fitting sits close to the window.