Drill Weep Vents Round Venting System Cavity / Retaining Walls Wall Drainage 12 x 9mm ( 3/8

12 x   9mm            ( 3/8 inch )12 x 13mm            ( 1/2 inch )12 x 19mm            ( 3/4 inch )10 x 25mm               ( 1 inch ) 4  x 32mm         ( 1 1/4 inch ) Measurement is the tool hole size

2BS 5250:2011 Control of Condensation in Buildings

Meets building regulations

Front: 20mm

0dB(A)Pre-oiled bearings for a long maintainance free life

Drill Weep Vents Round Venting System Cavity / Retaining Walls Wall Drainage 12 x 9mm ( 3/8Product Description Refurbishment Weep Vents Menu Options Quick and easy to install into a 25mm drill hole. Louvered chevron grill which protects against wind and driving rain. External flange covers any damage to the substitute caused by the drill Drip rib ensures clean moisture run off. Suitable for commercial and domestic use. Can be used on brick or rendered walls. Provides 260mm of ventilation per unit. Length: 85mm. Diameter: 25mm. Satisfies