Tilt and Turn Windows: How They Work and Which Internorm Model Fits
One handle, two ways to open: tilt the sash in at the top for airflow that keeps rain out, or swing it in like a door and clean the outside glass from indoors. InterHaus supplies and installs the full Internorm tilt and turn range across Ontario and Canada.
The short answer
Tilt and turn windows open inward two ways from one handle: tilted at the top for ventilation, or swung in like a door for cleaning. InterHaus, the official Internorm dealer in Canada, with a showroom in Oakville, Ontario, offers ten Internorm tilt and turn systems in uPVC, uPVC/aluminum and wood/aluminum, with Uw values as low as 0.62 W/m²K and security up to RC 3.
One handle, three positions
The handle tells you what the sash will do. Pointing down, the window is closed and locked, with locking points around the sash pressing it onto the gaskets. Horizontal, the sash swings into the room on side hinges like a small door. Pointing up, the sash tilts in at the top and is held by a stay arm, leaving a narrow gap for air.
Tilt is the everyday position: humid air leaves high in the room while the tilted sash keeps rain out. Turn is for a full change of air and for cleaning, since the outside of the glass comes to you, so upper floors never need a ladder.
Tilt and turn hardware normally includes a misoperation catch, so the sash cannot be tilted while it is swung open and left hanging from one hinge.
- Handle down: closed and locked
- Handle horizontal: turn, the sash swings in
- Handle up: tilt, the top of the sash leans in
What the frame and hardware do for you
Standard on Internorm tilt and turn windows, not upgrades.
Three continuous gaskets
Every Internorm window system has three circumferential gaskets. Locking draws the sash onto all three, keeping out wind-driven rain, drafts and noise.
Locking around the sash
Standard hardware uses octagonal mushroom cams around the sash. The KF 510 and KF 520 use I-tec Secure flaps that press into all four sides of the frame.
Concealed hinges
Hidden hardware stops the sash being levered off its hinges and leaves smooth faces that wipe clean in seconds.
I-tec Glazing
On most Internorm systems the glass is bonded to the sash all round, which keeps the sash square through years of use; the pane cannot be pushed out.
Every Internorm tilt and turn system, compared
Ten window systems, three frame materials, one way of opening. “Best” is the up-to value Internorm publishes; “standard” is the same window with Internorm’s standard glass coating.
| System | Frame | Uw best (W/m²K) | Uw standard | Sound (dB) | Security up to | Depth (mm) |
|---|---|---|---|---|---|---|
| KF 310 | uPVC or uPVC/aluminum | 0.69 | 0.76 | 33–45 | RC 2 | 71 / 74 |
| KF 410 | uPVC or uPVC/aluminum | 0.62 | 0.71 | 34–47 | RC 2 | 90 / 93 |
| KF 510 | uPVC or uPVC/aluminum | 0.63 / 0.64 | 0.71 / 0.72 | 34–46 / 34–48 | RC 3 | 90 / 93 |
| KF 520 | uPVC or uPVC/aluminum | 0.63 | 0.70 | 33–46 | RC 3 | 90 / 93 |
| KV 350 | uPVC/aluminum, integrated blinds | 0.79 | 1.0 | 38–44 | RC 2 | 74 |
| KV 440 | uPVC/aluminum, integrated blinds | 0.64 | 0.77 | 39–45 | RC 2 | 93 |
| HF 410 | Wood/aluminum | 0.64 | 0.71 | 33–46 | RC 2 | 85 |
| HF 510 | Wood/aluminum | 0.65 | 0.72 | 35–47 | RC 2 | 85 |
| HF 520 | Wood/aluminum | 0.71 | 0.78 | 35–47 | RC 2 | 90 |
| HV 450 | Wood/aluminum, integrated blinds | 0.62 | 0.97 | 39–46 | RC 2 | 85 |
From Internorm’s data sheets and 2026/27 catalogue. Paired figures are all-uPVC / uPVC/aluminum. These are European (EN) values; actual figures depend on size, glass and spacer, and we confirm them per opening with your quote.
Which tilt and turn window suits which house
Pick the frame material first. All-uPVC windows are the lowest-upkeep choice. uPVC/aluminum windows add a powder-coated aluminum shell for exterior colour. Wood/aluminum windows put spruce, larch, oak or walnut on the room side.
Then choose by sightline and security. The KF 310 is the compact, value-minded replacement window. The KF 410 is certified by the Passive House Institute. The KF 510 and KF 520 slim the frame (the KF 520’s frame-and-sash sightline is 85 mm, against 113 mm on the KF 410) and add I-tec Secure for RC 3. The KV 350, KV 440 and HV 450 hold blinds between the panes, and wood/aluminum windows can be set into HX 300 frameless glazing.
Opening types and combinations
Every window is made to measure: tilt and turn, tilt-only, turn-only or fixed, combined in one frame as needed. The same profiles make balcony and French doors.
How big can a tilt and turn window be?
There is no single maximum. It depends on the model, the sash proportions and the glass: triple glazing with laminated panes is heavy, and the hinges and stay arm carry that weight every time the sash moves. In short, it depends on model and glazing, and we confirm it per opening when we review your drawings.
When an opening is too big for one sash, split it into two with a fixed mullion or a flying mullion (a 96 mm sightline on the KF 520, 133 mm on the KF 410); combine opening sashes with fixed glazing in one frame; or, for a wall of glass, use HX 300 fixed glazing, with single panes up to 10.5 m², or a lift and slide door. Internorm describes the HF 510’s laminated I-tec Core as stable enough for even larger window sizes.
Tilt and turn vs casement vs awning for a Canadian home
Most Canadian houses have outward-opening casement or awning windows. The practical differences:
| Tilt and turn | Casement | Awning | |
|---|---|---|---|
| Opens | Inward: tilts or swings in | Outward on side hinges, by crank | Outward, hinged at top |
| Airing in light rain | Tilted sash keeps rain out | Open sash catches wind and rain | Sash acts as a small canopy |
| Outside glass cleaned | From inside | Depends on hinge design | Hard from inside |
| Insect screen | Outside | Inside | Inside |
| Room needed inside | Clear swing for the sash | None | None |
| Price in Canadian cost guides | Above casement, same material | Lower | Close to casement |
General comparison; products differ. The price row summarizes independent cost guides, not InterHaus pricing; see our European window cost guide.
Plan the inside of each opening
Because the sash swings in, deep sills, a kitchen faucet or a blind mounted inside the frame can get in the way. Over a sink, use a tilt-only sash or set the window above the tap; the photo from our Ottawa renovation shows black tilt and turn windows above a kitchen sink. Mount blinds on the wall above the opening, or choose blinds between the panes.
Comparing models by their numbers? Our U-value and window ratings guide explains Uw, ER and SHGC.
Insect screens for inward-opening windows
The sash opens inward, so the screen goes outside and stays in place whether you tilt or open the window. Internorm offers fixed, turn, sliding and pull-down flyscreens, plus a space-saving pleated flyscreen. A fixed screen suits bedrooms you only tilt; a hinged or pull-down screen suits windows you reach out of. Screens combine with exterior blinds and shutters, so we specify both together.
Inward opening, locked all round
With no exterior crank or hinge to attack, tilt and turn windows start from a strong position. Every system on this page is rated up to at least RC 2. The KF 510 and KF 520 add I-tec Secure, rated up to RC 3, and the Secustik handle, which resists the lock being shifted from outside. Lockable handles, a turn lock that allows tilting only, and laminated glass suit children’s rooms.
RC classes are European. The Ontario Building Code (Div. B, 9.7.5.3) requires windows within 2 m of adjacent ground to meet the forced-entry requirements of NAFS Clause 5.3.6. If your permit needs that documentation, raise it at quote stage and we will confirm what is available for your model.
Looking after tilt and turn hardware
Clean the frames when you clean the glass and oil the hinges about once a year. A QR code in each window’s rebate links to care tips, and Internorm’s Maintenance, Care and Warranties Manual comes with the windows: its hardware warranty depends on following those guidelines. Internorm adds a 30-year repair assurance, and InterHaus stays on call after handover for hinge greasing, hardware adjustments and small repairs.
“Absolutely incredible windows, best out there, and Interhaus has been a pleasure to work with. They « saved » us after a bad experience with another windows company, and I just wish we had found them from the beginning. Seamless process with them, excellent communication throughout. A++ competent and efficient installers. Highly recommend if you’re looking for high quality windows and amazing customer service.”
How we specify and install tilt and turn windows
InterHaus is the official Internorm dealer in Canada. At our Oakville showroom you can operate working tilt and turn windows, including ones with I-tec Shading, and compare frame samples side by side. Our product specialists have an architectural background and support architects and builders; we keep local warehousing in Ontario and provide installation guidance and supervision. Projects include the Etobicoke Passive House Residence, the Passive House Residence in Niagara-on-the-Lake and the Renovation Private Residence in Ottawa.
Tilt and turn windows: questions buyers ask
Yes. Locking presses the sash onto three continuous gaskets all round, and the tilt position lets you ventilate without opening the window wide. Internorm’s tilt and turn systems reach Uw values as low as 0.62 W/m²K.
A tilted sash keeps rain out, but it is not locked. Close and lock ground-floor and easy-to-reach windows when the house is empty. A lockable handle or a turn lock adds control in children’s rooms.
Usually, yes. Internorm windows are made to measure for your openings. We check each one for inside clearance, since the sash swings into the room, then install with an airtight connection to the wall.
The KF 410 is certified by the Passive House Institute and reaches a Uw as low as 0.62 W/m²K, in all-uPVC or uPVC/aluminum. InterHaus quotes Passive House projects within 72 hours.
It depends on the model, the sash proportions and the weight of the glass, so we confirm it per opening. Larger openings are split into two sashes or combined with fixed glazing.
Every Internorm tilt and turn window
KF 310
Compact six-chamber window.
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KF 410
Passive House certified.
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KF 510
Slim frame, I-tec Secure.
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KF 520
Sash hidden behind the glass.
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HF 410
Wood inside, aluminum outside.
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HF 510
I-tec Core for larger sizes.
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HF 520
Flush studio design.
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KV 350
Slim, blinds between the panes.
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KV 440
Flush, integrated blinds.
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HV 450
Wood/aluminum, integrated blinds.
ExploreTry a tilt and turn window, then get a quote
Send us drawings, sizes or photos of your openings and we will recommend a model and quote it. Or visit the Oakville showroom and open a tilt and turn window yourself.