Concrete Brick (H)65mm (W)102.5mm (L)215mm Common brick (L)215mm (W)103mm (H)65mm Toplite Aerated concrete Block (L)440mm (W)100mm Toplite Aerated concrete Block (L)440mm (W)100mm Pack of 90 Toplite Aerated concrete Block (L)440mm (W)140mm Cavity Wall Weep Vent 65 x 10 x 100mm Buff Cavity Wall Weep Vent 65 x 10 x 100mm Clear Timloc Plastic Airbrick 215 x 69mm Buff Timloc Plastic Airbrick 215 x 69mm Terracotta Telescopic Under Floor Vent Timloc Vertical Extension for Underfloor Vent 150mm (1204) Black Timloc Invisiweep Concealed Wall Weep Vent Terracotta Timloc Invisiweep Concealed Wall Weep Vent Grey Timloc Invisiweep Concealed Wall Weep Vent Buff Thermalite Aircrete Tongue & Groove Trenchblock 3.6n 440mm x 215mm x 300mm Thermalite Aircrete Shield Block 3.6n 440mm x 215mm x 100mm (10 blocks per m2) Air Brick Square Hole No.350 215 x (65mm) Buff Buff Square Hole Airbrick 215 x 140mm Square Air Brick with Holes No.352 215 x 215mm Red Air Brick Square Hole No.351 215 x 140mm Red Square Air Brick with Holes No.352 215 x 215mm Red Marshalls Red Perforated Engineering Brick - 215 x 100 x 65mm Marshalls Pack of 416 Mavado Facing Bricks, in Red, Size: 215x100x65mm Marshalls Pack of 416 Stratton Facing Bricks, in Grey, Size: 215x100x65mm