Product Information Description Measuring Guide Other Details Large white plastic ventilation grill 400mm x 83mm x 20mm Price per grommet Office Ergonomics - How To Do I Need A CPU Holder? How To Reduce Back Pain Ergonomic Desks & Tables Need It Fast? We Can Help! See Our International Shipping Options Request A Quote Today Large Ventilator Grommets, constructed of white plastic, measure 400mm long by 83mm wide. This Richelieu ventilator grommet allows heat dispersion and air transfer only. Cables will not pass through the openings in the grommet.