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Manrose DHRIWKBBS 100mm Internal Wall Kit with Backdraught Shutter – Brown

Original price was: £103.84.Current price is: £23.75. £28.50 Inc VAT

The Manrose DHRIWKBBS is a high-quality 100mm (4-inch) internal wall kit designed for through-the-wall ventilation. This kit includes a durable brown external grille and a built-in backdraught shutter. Specifically, the shutter prevents cold air from entering the property when the fan is not in use. Furthermore, its robust plastic construction ensures long-lasting performance in all weather conditions.

8 in stock

Estimated Standard Delivery May 4, 2026 - May 5, 2026

Description

Ensure a professional finish for your ventilation system with the Manrose DHRIWKBBS. This internal wall kit is the perfect solution for venting extractor fans through external walls. It provides a neat, weatherproof exit point for your 100mm ducting.

The standout feature of this kit is the integrated backdraught shutter. When your extractor fan turns off, the gravity shutters close automatically. Consequently, this stops annoying rattles and prevents cold wind from blowing back into your bathroom or kitchen.

Installation is straightforward and efficient. The kit is designed to fit standard 100mm (4″) circular ducting. Additionally, the brown finish is ideal for matching traditional brickwork or dark wood exteriors. Specifically, the UV-stabilized plastic resists fading and cracking over time. By choosing the Manrose DHRIWKBBS, you guarantee a more energy-efficient home by reducing unwanted heat loss.

Key Benefits:

  • Prevents Drafts: The gravity-operated shutter stops cold air from entering your home.

  • Discreet Aesthetics: The brown finish blends seamlessly with dark bricks and external masonry.

  • Easy to Install: Compatible with all standard 100mm extractor fans and ducting.

  • Weather Resistant: Constructed from high-grade, UV-stabilized plastic for durability.

  • Improved Efficiency: Helps maintain indoor temperatures by sealing the vent when not in use.

Technical Specifications

Feature Specification
Manufacturer Manrose
Product Code DHRIWKBBS
Spigot Diameter 100mm (4 Inch)
Grille Type Gravity Shutter (Backdraught)
Color/Finish Brown
Material UV-Stabilized ABS Plastic
Application Through-Wall Extraction
External Size 140mm x 140mm (approx)
Compatibility Standard 100mm Ducting