Low profile grey weep vents, suitable for commercial and domestic use. Satisfies NHBC standards. British made, manufactured to BS EN ISO 9001. Dimensions: 100mm x 64mm x 10mm. The product can be slotted between two bricks and mortared into position, providing an unobtrusive ventilation point for the cavity behind. Use in any situation where water must be discharged from an external wall, such as at ground floor slab level, within cavity tray systems, over external lintels, or for ventilating external walls 100mm or more in thickness built from brick, block or stone. Features & Benefits: Purpose-made and pre-formed to guarantee reliable discharge of water. Less prone to inadvertent pointing-up than weep holes formed by simply leaving the perp joint open. Integral front grille prevents entry of large nest building insects into the cavity. 4mm wide front aperture prevents entry of large nest building insects. Available in a range of colours to blend with brick or mortar colour. Quality: Satisfies all NHBC Standards 2006 Edition. Manufactured to BS EN ISO 9001:2000. Complies with all relevant Building Regulations. Meets all relevant British Standards.