organisms. They may be fitted with prefilters Attenuation to extend their service life. When used for the containment of hazardous 3.55 Cleaning access should be provided at both ends 3.59 substances, the installation should incorporate of any attenuator unit. design provision for the subsequent safe removal and of contaminated filters Identification and labelling by maintenance staff. All supply and extract ventilation systems should 3.60 be clearly labelled. The label should identify both Energy recovery the AHU and the area that it serves. The lettering Energy recovery, where fitted, will require 3.56 should be at least 50 mm high and be mounted in cleaning access to both sides of the device. an easily visible place near the fan of the unit. Any subsystems and the principal branch ducts Whichever type of energy recovery device is 3.57 should fitted, the extract side should be protected by a be similarly labelled. G3 filter and provided with a drainage system to remove condensate. The direction of air flow should be clearly 3.61 marked on all main and branch ducts. The heat-recovery device should be controlled 3.58 in sequence with the main heater-battery, and All air-flow test-points should be clearly 3.62 may need to incorporate a control to prevent identified, and the size of the duct given. the transfer of unwanted heat when the air-on condition rises above the plant’s required set- Pressure stabilisers Pressure stabilisers should be unobstructed 3.63 and silent in operation.
organisms. They may be fitted with prefilters to extend their service life. 3.55 When used for the containment of hazardous substances, the installation should incorporate design provision for the subsequent safe removal and of contaminated filters by maintenance staff. Energy recovery 3.56 Energy recovery, where fitted, will require cleaning access to both sides of the device. 3.57 Whichever type of energy recovery device is fitted, the extract side should be protected by a G3 filter and provided with a drainage system to remove condensate. 3.58 The heat-recovery device should be controlled in sequence with the main heater-battery, and may need to incorporate a control to prevent the transfer of unwanted heat when the air-on condition rises above the plant’s required Attenuation 3.59 Cleaning access should be provided at both ends of any attenuator unit. Identification and labelling 3.60 All supply and extract ventilation systems should be clearly labelled. The label should identify both the AHU and the area that it serves. The lettering should be at least 50 mm high and be mounted in an easily visible place near the fan of the unit. Any subsystems and the principal branch ducts should be similarly labelled. 3.61 The direction of air flow should be clearly marked on all main and branch ducts. 3.62 All air-flow test-points should be clearly identified, and the size of the duct given. Pressure stabilisers 3.63 Pressure stabilisers should be unobstructed and silent in operation. set-