Cladding

Suction band, cap sheets, stack and baffles from Versacor, Armacor, HP200 Plastisol or Aluminium protected metal.

Frames

Fabricated from mild steel (minimum thickness 5 mm) hot dipped galvanised after fabrication (to BS 729: 1971). Frame spacing is generally at 3.0 m centres, based on a 1.0KN/m² wind load.

Dampers

Dampers are an integral part of the ventilator and can be fixed or operable. They are constructed from Versacor protected metal and galvanised mild steel frame.

Birdguards

Concealed birdguards are available as an optional extra. Standard specification is PVC coated galvanised mild steel with a 13 mm square mesh.

Highly Corrosive Applications

Steel frames are further protected with PVC coating all over, with an average thickness of 3.2 mm.

Installation

The Zefyr HCD is suitable for fixing to a wide range of roof constructions. Ventilator base frames can be tailor-made for each contract to suit structural steelwork. Full fixing details are supplied.

Controls

These are available as an optional extra for control of ventilator exhaust capacity. Remotely controlled dampers are available using either electrically or pneumatically actuated control systems.

Routine Maintenance

Zefyr HCD ventilators are designed to be self cleaning and under normal conditions are maintenance free. For applications where heavy concentrations of dust or sand can be deposited within the ventilator, it is recommended that regular 6 monthly inspections are carried out to check dust build up which should then be removed once it becomes excessive.

Performance (Cd)

All Zefyr HCD ventilators have an independently certified coefficient of discharge of at least 0.65.