Small Polypropylene Adjustable Telescopic Weep Vent with 60mm2 Airflow in Clear Properties Airflow: 60mm2 at grill. Weep dimensions: 93mm x 24mm x 9.5mm. Extension: additional 70mm max. Material: polypropelene. ODP: zero. Colour: clear. Description The Small Adjustable Weepvent offers discreet appearance with a rectangular front discharge outlet and an insect resistant grille. A removable protective flap protects the front face from being contaminated during building-in. The telescopic body of this Weepvent permits it to be lengthened or shortened to suit different masonry thickness / rendered applications.