Ubbink OFT 5 Insulated Flat Roof Terminal

The Ubbink OFT 5 Insulated Flat Roof Terminal is a high-performance solution designed for both mechanical and passive ventilation systems, including those used with heat recovery units and high-volume extract fans. Engineered for modern building requirements, it’s suitable for new builds and renovation projects alike. What sets the OFT 5 apart is its superior insulation value above the roof level, which helps reduce the risk of condensation forming inside the terminal—especially important in colder climates or high-humidity applications.

High Performance and Versatile Installation

Thanks to its large free vent area and low pressure (Pa) resistance, this terminal supports excellent ventilation capacity, ensuring your systems operate efficiently. The unit is manufactured from high-quality polypropylene (PP), making it strong, durable, and resistant to all weather conditions. It’s designed for flexibility and can be installed on a wide variety of flat roof finishes, including: Asphalt Built-up felt EPDM Bitumen GRP roofing systems The internal spigot measures 166mm, except on the OFT 5 180mm variant, and reducers are included to allow compatibility with other duct sizes.

Designed for Function and Style

Beyond its technical advantages, the OFT 5 terminal also features an elegant, low-profile design that looks clean and professional once installed. The terminal is fully insulated up to the cowl, ensuring consistent performance throughout its structure. Whether you're working on a high-spec new build or upgrading an older ventilation system, the OFT 5 delivers reliability, efficiency, and aesthetic appeal in one complete package.

Key Features

Ideal for heat recovery units and high-volume extract systems Suitable for mechanical and passive (natural) ventilation Large free vent area with low pressure drop Internal spigot: 166mm (with reducers included) Made from high-quality, weather-resistant polypropylene Fully insulated right up to the cowl Compatible with asphalt, felt, EPDM, bitumen, and GRP flat roofs Sleek, modern design suitable for new builds or retrofits

Frequently Asked Questions

1. Can the OFT 5 be used on all types of flat roofing?

Yes, it’s compatible with a wide range of flat roof finishes including **asphalt, built-up felt, EPDM, bitumen, and GRP**, making it highly versatile for both modern and traditional roofing systems.

2. What size ducting is the OFT 5 compatible with?

The standard internal spigot is **166mm**, but **reducers are included** with the unit to ensure compatibility with smaller duct sizes if needed.

3. Does the insulation run throughout the whole unit?

Yes, the OFT 5 is **fully insulated up to the cowl**, helping to prevent condensation and thermal bridging, particularly in colder conditions.