Dorgard Acoustic Hold Open Door Release Device Enhance the functionality and convenience of your doors with the Dorgard Acoustic Hold Open Door Release Device. Designed by Dorgard, a leading manufacturer in the industry, this device in a sleek black finish offers a range of benefits that elevate your door management experience. Benefits: Effortless door hold-open functionality Enhanced accessibility for all users Improved ventilation and air circulation Reduced risk of door-related accidents Easy installation and operation Overall height - 205mm Casing height - 150mm Width - 195mm Depth - 45mm Weight - 700g Power - 2 x 1.5v C-size batteries Max door size - Power size 7, max weight 160kg Suitable for FD30, FD60, and FD120 fire doors fire doors up to EN power size 7 Built in safety feature releases the closer if the general noise level exceeds 65 decibels. Automatic night time release facility. Battery operated wireless unit. Complies with BS EN 1155. Complies with