NKVD-PS
General Information
Description
The Bovema NKVD-PS twin flap ventilator provides an economical and energy efficient method of exhausting large quantities of warm air and / or smoke from a building.
The NKVD-PS is particularly suitable for industrial and commercial buildings where the overall building design requires low rates of air leakage, good sound attenuation or good thermal insulation performance.
The NKVD–PS is manufactured with a built in 10 Deg slope, which allows for the installation of a ventilator with glazed flaps on a completely flat roof, to prevent the staining of glazed units. The sloping flaps also aid the shedding of rain or snow in areas with severe winter climates.
The NKVD–PS ventilator is manufactured to NEN-EN-ISO 9002 quality control standards and is designed and tested, to comply with various national standards for smoke ventilators, such as BS: 7346: Pt1: 1990 in the UK and DIN 18232 in Germany.
The NKVD-PS ventilator is manufactured from high quality, corrosion resistant aluminium to ensure low maintenance requirements.
The NKVD–PS ventilator is a versatile design, allowing a wide range of variations to be manufactured, from single skin to fully insulated and thermally broken units. With electric or pneumatic operating systems, as required to meet the project specification requirements.
Specially designed units are available to provide for the very high levels of sound reduction in theatres or similar noise sensitive buildings.
Operating Principles
Warm air is lighter than cold air and rises by convection. Using this natural ventilation principle, assisted as appropriate by wind action, large quantities of warm air or smoke can be evacuated from a building. The NKVD-PS natural ventilator utilises this principle to provide high levels of ventilation. Each ventilator has two large flaps, each of which close on single or double EDPM seals to provide an air and watertight seal around the full perimeter of the unit. A fully welded upstand and central gutter combine to drain water from the flaps directly onto the roof, without first entering the building and the sloping construction aids the drainage system in poor environmental conditions. The flaps themselves are hinged outside of the air-stream and this allows the ventilator flaps to open fully to 90 Deg. This maximises the free area available for ventilation.
Operation to open and close is by pneumatic or electric actuators, which are operated via remote control panels, allowing interface connections to rain, wind detectors, BMS or fire Alarm systems.
Applications
- Theatres;
- Industrial buildings;
- Shopping malls;
- Commercial buildings;
- Multifunctional buildings;
- Swimming pools;
- Etc.
Specifications
Flaps:
- 1.5 - 2.0 mm single skin aluminium;
- 20 mm/ 60 mm / 100 mm thick double skin aluminium with thermal insulation;
- Special acoustic insulated aluminium
- 10 mm / 16 mm / 25 mm insulated polycarbonate;
- 6 mm Georgian wired, toughened or laminated glass;
- 18-22 mm double-glazed insulated units (in various compositions).
Base construction:
- 2.0 mm single skin aluminium;
- Double skin aluminium, with thermal insulation;
- Double skin aluminium, thermally broken, with full insulation.
Despatching
The NKVD - PS twin flap ventilator is fully assembled and tested before despatch.
The standard unit is supplied in natural mill finished aluminium, but a Polyester Powder Paint finish may be supplied to any available RAL colour, selected from the standard Bovema range. Other optional items such as bird screens, sound attenuators, sprinkler shields and open / close location switches are also available.
The ventilator bases and fixing flanges are of fully welded construction and the versatile base design allows installation onto most building types.
Standard flange sizes are 100 mm but special sizes can be supplied to meet project requirements and ensure simple, weatherproof installation.