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keypak Letter Box Review: Adjustable fit and draught protection

Keypak 12" (30.6cm) Sleeved Letter Box - for 40-80mm Door Thickness, Anti-Snap Flap, Internal Draught Excluder, Adjustable Letterbox for UPVC Composite Wood Doors (Silver/Polished Silver)
4.6
[Fits 40–80mm Doors]  12" model fits doors 40–80mm thick; measure door depth for compatibility.
[Anti-Snap 180° Flap]  Opens a full 180° for easy access and prevents the flap from snapping off.
[Telescopic Adjustable Sleeve]  Adjusts to fit uPVC, composite and timber doors between 40mm and 80mm thick.
[Precise Dimensions & Fit]  Overall 306×70mm, internal sleeve 254×37mm, screw centres 280mm; fits 285×50–295×60mm apertures.
[Draught & Water Protection]  Integrated brushes reduce draughts; internal water seal prevents leaks into door or panel.
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Home improvement hardware designed to secure post and reduce draughts while giving a neat front-door finish. Homeowners who want a straightforward upgrade with a modern look will value the practicality and durability. Is the keypak Letter Box the right fit for your door?

⚡ At a Glance
  • Weather Protection: Integrated brushes and an internal water seal help keep draughts and moisture out
  • Best for: Homeowners fitting letterboxes into uPVC, composite or timber doors
  • Not ideal for: Doors thinner than 40mm or thicker than 80mm without modification

Telescopic sleeve adjusts to doors 40-80mm thick to suit common fittings. Anti-snap flap opens 180 degrees and internal seals reduce draughts and water ingress.


Secure, tidy fit – with an adjustable telescopic sleeve

Telescopic sleeve extends and retracts to match door depths between 40mm and 80mm, letting the faceplate and inner sleeve meet flush. Mounting holes are positioned with a 280mm centre-to-centre spacing to align with common door apertures.

A flush finish avoids awkward gaps and makes retrofitting into UPVC, composite or timber doors straightforward. Measuring the existing aperture and door depth ensures a neat installation.

Reduced damage risk when opening – thanks to an anti-snap 180 degree flap

Flap hinges are engineered to open a full 180 degrees so the flap does not strain or snap when pushed back. Robust construction supports frequent use without deforming the hinge.

Letters can be removed without forcing the flap, which reduces the chance of breakage and keeps the front of the door looking smart. The full-opening action also makes larger envelopes easier to retrieve.

Draught and water protection – with internal brushes and a water seal

Brush strips line the internal sleeve to block airflow while an internal water seal prevents moisture tracking into the door panel. The combined measures form both a draught excluder and a barrier to light water ingress.

Hallway cold spots are reduced and incoming mail stays drier during wet weather. The solution helps keep interiors warmer and avoids water damage at the door aperture.

✨ The 4 Key Reasons for keypak Letter Box
  1. Telescopic sleeve - Fits 40-80mm doors without extra trimming or parts
  2. Anti-snap flap - Full 180 degree opening prevents hinge damage when opened
  3. Integrated draught brush - Keeps cold air out for a noticeably warmer hallway
  4. Durable finish - Sturdy construction maintains appearance despite weather exposure
📋 Technical Details at a Glance
  • Category: Home Improvement
  • Brand: keypak
  • Material/Finish: Silver / Polished Silver
  • Overall Size: 306mm x 70mm
  • Sleeve Internal Dimension: 254mm x 37mm
❓ Frequently Asked Questions

Q: Will the letter box fit my door?

A: Measure door thickness and the current aperture. The sleeve adjusts to fit doors 40-80mm thick and is suitable for apertures around 285mm x 50mm up to 295mm x 60mm.

Q: Is installation difficult?

A: Installation is straightforward, aided by the telescopic sleeve that adapts to door depth and the standard 280mm screw hole centres. User feedback reports quick, easy installation in minutes.

Q: Will it stop draughts and water getting into the door?

A: Internal brush strips reduce draughts and an internal water seal helps prevent water ingress into the door or panel.

🏆 Our Verdict

The keypak Letter Box suits homeowners who want a practical, low-maintenance upgrade for uPVC, composite or timber doors. Telescopic adjustment, an anti-snap 180 degree flap and internal seals combine to deliver a secure, draught-reducing letter aperture. A robust finish and simple fitting promise long-term value for a brief installation effort.