China sliding window custom screen

When a buyer asks a Chinese factory for a "custom screen" on a sliding window, the phrase quietly covers two different things that are easy to conflate. The first is a custom mesh — choosing the material and the weave for the climate you actually have and the insects you are really fighting. The second is a custom fit — cutting and retaining that mesh to one specific sash and opening rather than buying a roll and hoping it fits. Both are real, and both decide whether the screen still works in year three. This guide separates the two, shows where Chinese suppliers genuinely differ, and maps the options onto a real aluminium system window so you can specify the screen instead of guessing at it.

A screen is part of the window system, not an add-on

The most expensive mistake in this category is treating the screen as something you bolt on later. On a system sliding window the screen shares the same extruded profiles as the glass sash — it lives in the frame, the interlock and the drainage path. A screen that is splined into a generic frame after delivery never seals as well, never slides as smoothly, and rarely carries the same warranty as the window it is stuck onto. That is the core reason a "custom screen" from a window maker and a "custom screen" from a mesh trader are not the same product even when the mesh roll in the box is identical.

Choosing the mesh material

Four materials dominate the market, and each is a trade rather than an upgrade:

On its aluminium lines, ALPES fits stainless steel meshes (a 40# and an 80# black or grey version) on the sliding and tilt-and-turn ranges, a high-elastic mesh on the heavy-duty slider, and a black high-definition anti-PM2.5 mesh as an option. The point is that the choice is made at order time and built into the profile, not lifted from a roll at the site.

40# versus 80# — what the number actually means

The 40# and 80# labels refer to the wire gauge and the weave density of the stainless steel mesh. The finer 80# weave blocks smaller insects and more airborne dust, but it gives slightly less airflow and slightly lower optical clarity. The coarser 40# is more open, tougher, and reads as clearer glass. Neither is "better" — it is a trade between insect size, dust load, ventilation and visibility, and the right pick depends on where the window sits. The default sliding window black and grey stainless meshes reduce glare and look nearly invisible from indoors, which is exactly why they are the standard finish on most ALPES sliding lines.

The anti-PM2.5 mesh — ask for the number, not the name

"Anti-PM2.5" is a marketing name for a finer high-definition mesh, not a guaranteed filtration rating. Do not read a specific particle figure into the label. The number that matters is the one on the spec sheet — the actual aperture or pore rating and the test method, both in writing. Offered as an option on the C113 and C116 and as an alternative on the C120, it is a sensible choice for dust-heavy urban sites, but specify it by its measured aperture, not by its name.

How the screen is held matters more than the wire

A system screen and a site-cut screen differ most at the joint. On the C120, the mesh uses a nail-free rolled-press structure — corrosion- and stain-resistant, roller-precision pressed, and flush with the frame — and the frame, the sash and the mesh are sealed together with injection-moulded structural adhesive. The TS130 side-press sliding window adds an inward-opening sash mesh so the outer face is cleaned from inside (safer on upper floors) and an anti-theft grille option. Set against a generic spline-and-frame screen held only by a rubber cord, the retention method, the colour match to the powder coat, and whether the sash still slides freely with the mesh fitted are the three questions that separate a system screen from an afterthought.

Match the screen to the climate

• Coastal or high humidity — Saudi, Dubai and Australian villa projects — call for stainless steel mesh and a corrosion-resistant frame. The 304 stainless steel high-load hinges used on the C116 exist for this reason.
• Dust-heavy cities — the high-definition anti-PM2.5 mesh earns its keep here.
• High-rise — an inward-opening sash mesh lets the outer face be cleaned from inside, removing the need to lean out.
• Security — an anti-theft grille integrated into the system, not screwed to it afterwards.

In a sliding window in kitchen the screen does double duty: it keeps insects out while the window stays open for extraction, so the mesh must clear the handles and the glass-cleaning path rather than fighting them.

Measuring a custom screen

Good screen measuring is boring and specific. Give width then height. Measure every opening on its own even when they look identical, because small construction differences add up. Do not round — work to a few millimetres or the nearest eighth of an inch. Account for handles, locks and any hardware the mesh must clear, and check whether the screen thickness changes the reveal. Even an oversized 36 x 72 sliding window is screened as one made-to-measure panel rather than pieced together, because a seam in the mesh is the first place it sags. On a system window this is done at the factory from the confirmed sash dimensions, which is why a factory-made screen fits better than a site-cut one.

The China-supplier differentiator, stated honestly

Anping in Hebei is the world's commodity mesh hub — hundreds of ISO 9001 traders sell 304 and 316 stainless steel and aluminium mesh by the roll, with OEM and ODM and low minimum orders. That part is easy and available to anyone. The hard part is whether the screen is engineered into the extrusion: the same powder-coat colour as the frame, held by the profile, sealed against the weather, and validated to slide. A window-system maker, rather than a mesh trader, is the party that owns that interface. Ask to see the screen fitted to the actual profile, not a loose sample pulled from a roll.

RFQ checklist — questions to put to any China supplier

1. Mesh grade and weave — 40#, 80#, anti-PM2.5 or high-elastic — and which models each fits.
2. Material certificate (304 or 316 stainless, or aluminium alloy) and country of origin.
3. How the mesh is retained — spline, rolled-press, or structural adhesive.
4. Colour match to the frame powder coat.
5. Does the sash still meet its sliding and locking spec with the mesh fitted?
6. Aperture or pore rating and the test method, both in writing.
7. Made-to-measure from confirmed sash dimensions, or cut-to-size at the site?
8. Cleaning guidance and warranty terms, in writing.

ALPES screen options by model

When you specify a China sliding window custom screen, the mesh itself is the cheap part. The value is in the integration — the same colour, the same profile, the same seal — and that is the question to put to the factory in writing before the order is cut.