Description: Simon Vent-A-Matic controllable ventilators are available in various models and sizes. Equipped with a diffusing rotor which operates with the slightest differential in air pressure. Specification: Airflow tested to BS 13141-1:2004 as required by Approved Document "F" of Building Regulations. The above models come complete with radial shutter control, operated by a pull cord. The 101 & 105 do not have any control,these are permanent airflow models. Aperture Adaptors are available. These allow units with an aperture size of 162mm to be fitted in to 200mm dia. holes. Storm Guards are available for all models and can be retro-fitted. Design Criteria: All above models ( except DGS/106 ) are suitable for single glazed units upto 6 mm thick. The double glazed unit DGS/106 is suitable for hermetically sealed unit from 12mm to 32mm Manufacture: All the Vent-A-Matic models are injection moulded and made from UV stabilised translucent polystyrene to avoid discolouration. Ultrasonically welded and assembled in Simons own cleanroom environment. Simon Vent-A-Matic glass mounted rotary ventilators are produced under ISO 9001:2000 Quality Systems. BVQI certificate no. 22389 Assembly & Maintenance: All the models are designed for simple two part fitting into the glass aperture For additional security and weather tightness, a little silicone glazing sealantcan be applied to the external retaining ring. In the case of the double glazed unit DGS/106 if it is a replacement unit this can be easily done by the occupier. If a new hermetically sealed unit is required, then the DGS/106 must be fitted by the double glazing manufacturer and requested prior to the making of the sealed unit. The ventilators can be cleaned with normal window cleaning materials.