. . ...\n3 x National Ventilation 4902C Cowled Wall Outlets - 4 Inch / 100mm (Cotswold Sand)\n--For use with 100mm / 4 Inch diameter ducting\n--Can reduce backdraught problems\n--Cowled external grille with backdraught shutter\n--Concealed fixing points (screws not included) Dimensions: 155mm wide x 155mm tall x 80mm deep (at deepest point)\nVAT INVOICE ON REQUESTCollection is also availableMonday - Thursday: 7.30am to 4.30pmFriday : 7.30am - 3pm