Our 12” heavy duty letterboxes are engineered as a high-performance mail solution for timber, composite, and uPVC doors, accommodating door thicknesses from 40 mm to 80 mm. Manufactured from high-grade zinc alloy and 304 stainless steel, they deliver strength, stability, and long-term resistance to corrosion in exposed environments.

Fully weather sealed as standard, each letterbox features an external foam draught seal and internal brush system to reduce draughts, noise, and water ingress - making the design particularly well suited to acoustic door sets and high-traffic installations.

Select configurations are smart-ready, allowing a discreet sensor module to be retrofitted at a later date. This enables app-based notifications when the letterplate is opened, adding modern monitoring functionality without replacing the letterbox or altering its traditional appearance.

Unique Features

• Suitable for door thicknesses from 40 mm to 80 mm

• High-grade zinc alloy and 304 stainless steel construction

• Fully weather-sealed backplate with external foam draught seal

• Internal brush system to reduce draughts and noise

• Heavy-duty flap springs for frequent operation

• Smart-ready design allowing retrofit of a sensor module

• Suitable for residential, commercial, and acoustic door applications

Certificates

• 480-hour neutral salt spray corrosion resistance testing

• 10-year mechanical guarantee covering flap springs and hinge performance

• Lifetime finish guarantee using a multi-layer coating process