Kair Airbrick with Surround - Fits 204mm x 60mm Ducting Fits on to 204mm x 60mm Rectangular Duct Pipe Part DUCVKC5604. The plastic surround extends around the airbrick fascia and provides a neat and convenient finish and helps cover up any aesthetic damage to mortar caused by brick removal. These Kair Airbricks with Surround provide a simple option for ventilation installation in brick walls and can be used with all common ventilation system. They can provide passive ventilation to a building, or be used as part of an extractor fan, heat recovery, or positive pressure ventilation system. They are easy to fit as the building is constructed, or they can easily be fitted in an existing wall where a brick is relatively easy to remove compared to drilling a new hole for a round vent. Suitable to use in compliance with Part F Building Regulations. Airflow performance independently tested by BSRIA or BRE. Free Air = 7680 mm2 Static Pressure Drop in Pascals: 15 l/s = 6.50 Pa - 30 l/s = 18.40 Pa - 60 l/s = 78.00 Pa. Kair ducting is made in the UK using high-quality plastic. Kair products are compatible with the extensive range of fittings, outlets, and grilles in multiple sizes to offer you a complete solution for all of your ventilation needs.