Zero dropseals are fitted to the bottom of the door and automatically drop down each time the door is closed (adjustable drop up to 25.4mm on some patterns). The mechanical unit requires no electrical power to operate, and works on a hinge side plunger with flat spring mechanism that drops the neoprene gasket in a scissor like motion for a tight seal without any drag, even on an uneven floor. As the neoprene seal compresses, it forms a tight secure bond against the threshold or floor. The door seal retracts automatically when the door is opened.
Zero dropseals have been tested to five million cycles and are also available surface mounted (for retrofit). The product is available in stock sizes from 305mm to 3497mm in 152mm increments, and may be cut down by up to 152mm (less for sizes under 762mm) from the non-operating end to suit exact door widths. Units are not handed (except 321AA, 323A and 354A), and operate from one end only so they can be used on pairs of doors.
Special purpose dropseals are also available with light springing for wheelchair users, with lead lining for X-ray doors, and with carbon filled silicone rubber gasket to combat electromagnetic/radio frequency interference. These units ensure an effective seal at the bottom of the door against air and smoke filtration, or penetration by sound, light, flames, toxic gases, electromagnetic and radio interference or X-rays. Used in conjunction with other Zero frame seals they form part of a total door kit.
All ZERO automatic door bottoms function the same way. The mechanism causes the insert seal to activate on the hinge side first. It prevents the seal from dragging along the floor or threshold while the door is being closed to avoid door hang-up or closing delay.
- Adjustable drop to 12.7mm, 14.3mm or 25.4mm as detailed. - Surface mounted or mortice patterns. - Units can be trimmed on site. - Integral intumescent available. - Light springing (L/S) pattern available for disabled use. - Tested to 5 million cycles. - Non-handed (except 321AA, 323A, 354A). - Suitable for double doors. - EMI/RFI shielding (lead lined doors). - UL Listed in USA, File GVY1.R18465. - UK Assessments to BS 476: Part 22: 1987 and EN 1634-1: 2000. WF Report No. 187914 Issue 4, 347177 and UL UK File NC26268. Copies available upon request.
TYPICAL BUILDINGS REQUIRING DROPSEALS Entrances - particularly in areas of inclusive design where thresholds are not allowed. Entertainment - cinemas (keeping sound out), nightclubs (keeping sound in), theatres, stadia. Broadcasting - TV & Radio companies, recording studios. Travel - airports, railways, ferry terminals. Industrial - oil rigs, turbine rooms, plant rooms, factory offices. Medical - doctors' surgeries, health centres, hospitals, consulting rooms. Business - offices, meeting/conference rooms, computer rooms. Education - university/college lecture theatres, research facilities, music rooms. Public - libraries. Interview - police stations, magistrates courts, banks, building societies, rooms drink & drugs rehabilitation, legal practices, probation offices. Research - laboratories, dark rooms. Leisure - hotel bedrooms, conference facilities.
