The Bovema ADH roof ventilator is an aluminium roof extract unit, with an axial flow fan, designed to remove large volumes of air, with low energy consumption. It is particularly suitable for the exhaust of free air from large buildings, with low system resistance.
The aerodynamic low profile, spun aluminium roof cowl, protects against water penetration.
The lightweight aluminium construction is suitable for installation onto steel, wood or concrete upstands and the ventilator can be supplied with purpose-designed flanges, to match various types of glazing systems.
The special flange systems allow the direct installation of the ADH ventilator into a rooflight construction without the need for additional structural openings.
The low profile ADH ventilator is manufactured to NEN-ISO 9002 quality control standards, from high quality corrosion resistant aluminium, to ensure long life and low maintenance.
The motor is directly connected to the fan shaft for minimal transmission losses and the extract air, which passes through the unit, is discharged below the weather protected roof cowl and cools the fan motors. Where fitted the optional gravity shutters are lifted by the fan pressure, to allow air to be expelled. When the fan stops they close to cover the opening, enhancing the weather protection and preventing air loss through the ventilator in winter or at other times when ventilation is not required. The ADH ventilator is suitable for continuous operation.
The ADH mechanical extract fan unit is supplied fully assembled and is tested before despatch.
As standard the unit is manufactured in natural mill finished aluminium but can be polyester powder paint finished, to any RAL colour, selected from the Bovema standard colour range.
They will despatch with:
- Fully welded aluminium base unit for upstand or glazing system installation;
- Aluminium cased motor to IP55 rating and class F insulation;
- Aluminium axial flow fan with adjustable blade angles;
- Aluminium cowl, removable for maintenance;
- Stainless steel birdguards;
Options:
- Motor protection for 100% Relative Humidity (Moisture proof);
- Explosion proof motors;
- Motor for non-standard voltages;
- Motor with frequency speed control;
- Gravity based non-return shutters;
- Local isolation switch;
- Single skin aluminium upstand;
- Double skin, insulated aluminium upstand.