A cleanroom window is a small component with a large responsibility: it must let people see through a wall without opening it, without fogging, and without becoming a contamination risk itself. This guide walks through the stated construction of the double glazed cleanroom window detail by detail, so a buyer can check a delivered window against the specification rather than judging it by appearance alone. The three details are the frame, the beading with desiccant, and the glass, and each one answers a different failure mode.
The frame is a purification-grade aluminium alloy frame. Purification grade here means a frame made for cleanroom walls, with a finish and a fixing line suited to a wall that must be cleaned and sealed, rather than a general building window frame adapted to a cleanroom. When a window schedule is written, the frame line should name the purification-grade aluminium alloy frame explicitly, so a substitute frame cannot be supplied on the assumption that any aluminium frame will do. Opening sizes should be listed per window, with the wall each window sits in, because the frame must suit the wall thickness and the wall finish on both sides.
The beading is PVC beading, and beneath the beading sits desiccant that absorbs moisture so the unit resists fogging. Fogging is the failure this detail prevents: a double glazed unit that fogs from within cannot be cleaned from the room, and it defeats the purpose of a vision panel. Stating the desiccant as part of the window detail, rather than leaving it as an assumed internal detail, lets the buyer ask the right question on delivery: is the desiccant present under the beading as specified, and is the unit sealed as specified. If either answer is unclear, the window should not be accepted on appearance alone.
The glass is toughened white glass, stated as three to five times the strength of ordinary glass and breaking into blunt small particles rather than sharp shards. That breakage pattern is a safety property as much as a strength property: in a room where people work close to glazed walls, the way glass fails matters as much as the load it survives. A window schedule should therefore record the glass type per window, not just the opening size, and any request for a different glass type should be treated as a specification change to confirm, not as a like-for-like substitution.
Two related guides on this site cover the questions this guide does not answer. The flush windows guide explains why flush installation is treated as a confirmation item rather than a standard detail, and the stainless steel windows guide explains why a stainless steel window frame is treated the same way. Reading those guides alongside this one gives a complete picture: the standard window detail is fully stated here, and everything outside it is named as a question to ask.
- Frame detail: purification-grade aluminium alloy, named explicitly per window.
- Beading detail: PVC beading with desiccant beneath, absorbing moisture and resisting fogging.
- Glass detail: toughened white glass, 3 to 5 times ordinary strength, blunt small particles on breakage.
- Schedule per window: opening size, wall, frame, beading, glass.
- Related guides: flush windows, stainless steel windows, and the double glazed window detail page.
Window detail checklist
| Detail | Check on delivery |
|---|---|
| Frame | Purification-grade aluminium alloy as specified |
| Beading | PVC beading with desiccant beneath |
| Glass | Toughened white glass as specified |
How to read the specifications on this page
Dimensions and construction details on this page follow the Lairun product description for the component family shown. Door opening sizes quoted on this site are brochure dimensions: they describe the opening sizes listed in the product brochure, and any non-standard size should be confirmed in the inquiry. Aluminium profile codes are listed by code only; no profile dimension is stated where the product description does not give one. Items that the product description does not specify are marked for inquiry confirmation rather than described as available options, so buyers are not led to assume a mechanism, a load figure, or a material variant that has not been evidenced.
What to put in your inquiry
Send the opening sizes you need, the leaf arrangement, the surface finish you prefer, and the ceiling layout where the components will be installed. State the quantities per size, the site conditions, and the delivery location so the component list can be checked line by line. Where this page lists an item as subject to confirmation, include that item explicitly in your message so it is answered before any order is placed. Please confirm the minimum order quantity and the lead time in your inquiry, because this site does not publish those figures. Certificates are available upon request; please ask for the documents you need and state which project they are for.