Window Opening Types Explained
Choosing an opening type is one of the first decisions on a window order, because it affects ventilation, cleaning, hardware cost and how the window sits against balconies and walkways. HK Building Materials supplies aluminium windows in casement, sliding, fixed and tilt and turn designs, plus PVC windows in casement and sliding designs, from Foshan, Guangdong. This guide explains how each type works, where it fits best, and what to confirm before you place a container order.
Casement Windows
Casement windows are hinged at the side and swing outward or inward, giving full opening of the sash for ventilation. They seal tightly against the frame when closed, which helps with wind and rain exposure on upper floors. HKBM lists 26 aluminium casement window models and 14 PVC casement window models, so both frame materials are covered. They suit bedrooms, kitchens and any room where you want maximum airflow from a single opening. Keep in mind that outward opening sashes need clear space outside, so check balcony and walkway clearance on your drawings. Hardware brand, glass thickness and screen options are confirmed per order.
Sliding Windows
Sliding windows move horizontally on tracks, so the sash never projects inside or outside the building. That makes them the practical choice where windows face corridors, balconies or tight passages. HKBM carries 15 aluminium sliding window models and 12 PVC sliding window models. Ventilation is limited to roughly half the opening at any time, since one sash always overlaps the other. Track and roller quality matter more here than on any other type, so ask for the roller and track specification when you request a quotation. Fly screens can be fitted in a separate track, confirmed per order.
Fixed Windows
Fixed windows do not open at all; they are glass set in a frame for light and views only. Because there is no hardware, no hinge and no lock, they are the simplest and usually the most economical unit per square metre. HKBM lists 12 aluminium fixed window models. They work well for stairwells, high gable walls, shopfront style glazing and anywhere ventilation comes from elsewhere. A common layout combines fixed panes with casement or sliding units in the same frame system, so confirm which combinations the chosen series supports. Glass type, tint and thickness are confirmed per order.
Tilt and Turn Windows
Tilt and turn windows open two ways from one handle: tilting in from the top for secure ventilation, or swinging in like a door for full opening and easy cleaning from inside. They are common in European projects and suit bedrooms and apartments where outside cleaning is difficult. HKBM lists 10 aluminium tilt and turn window models. The inward swing needs clear interior space, so check furniture and curtain positions on the room plan. The hardware set is more complex than a casement, so confirm the hardware brand and spare parts supply before ordering in volume.
Aluminium or PVC Frames
Aluminium frames are slimmer for the same opening size, handle larger sashes, and suit modern elevations and coastal or high rise work with the right surface finish. PVC frames give good thermal insulation at a lower material cost and are widely used in residential projects. HKBM supplies both: 63 aluminium window models across casement, sliding, fixed and tilt and turn, and 26 PVC window models across casement and sliding. Finish options such as powder coating colours for aluminium are confirmed per order. If your project mixes doors and windows, matching aluminium door series are also available, including casement, sliding and folding designs.
How to Specify for A Container Order
Start with a window schedule: opening type, width, height, quantity and floor level for every unit. State the frame material, glass type, screen requirement and colour for each line, because mixed specifications in one container are normal but must be listed clearly. HKBM consolidates windows with doors, tiles, railings, roof sheets, ceilings, bathroom fittings, furniture and lights in one shipment, so a full project can load together. PDF catalogues for the window ranges are sent on request, and packing, quantity per crate and container loading details are confirmed per order. Contact Coco Qiu or Johnny Wong on WhatsApp or by email with your schedule for a quotation.
Key Takeaways
- Casement gives full ventilation; sliding saves space; fixed gives light only; tilt and turn adds secure ventilation plus inside cleaning.
- HKBM supplies aluminium windows in casement, sliding, fixed and tilt and turn, and PVC windows in casement and sliding.
- Send a full window schedule with sizes, glass, screens and colours before asking for a container price.
- Windows can consolidate with doors, tiles and other HKBM ranges in one shipment; packing details are confirmed per order.
Window Opening Types Explained FAQ
Which Opening Type Is Best for a Rental Apartment Project
Sliding windows are common for rentals because they are simple to operate and do not project into walkways or balconies. Casement units give better ventilation where clearance outside allows. The final mix depends on your floor plans and local practice.
Can I Mix Aluminium and PVC Windows in One Container
Yes, mixed specifications and mixed ranges can be consolidated in one shipment. List each unit on a clear schedule with material, size, glass and colour, and packing and loading details are confirmed per order.
Do the Windows Come with Fly Screens
Screens can be supplied for sliding and casement types, with the screen track or frame matched to the window series. Confirm the screen requirement per line item when you request a quotation.
How Do I Get Sizes and Prices for My Project
Send your window schedule to Coco Qiu or Johnny Wong on WhatsApp or by email. PDF catalogues for the window ranges are sent on request, and pricing is quoted against your actual sizes and specifications.
Start With a Model List
Send the trades and quantities your project needs. We come back with one quotation covering the whole list.