VENTILATION


Post-clean (ward).


a competent, compliant ppm regime that utilises only proven competent technicians. If these surveys and cleans are


Pre-clean (ward).


scientific evidence-based assessment and recommendation for either localised or full system cleaning.


How should a clean be conducted? All cleaning in ductwork should be undertaken in the direction of air flow, and contractors should isolate zones where possible by utilising the open/shut operation of VCD. On all dry-cleaning methods, make sure a suitable (negative air) air mover machine is in place with suitable filtration appropriate to the standard of cleaning. Wet cleaning methods should be avoided, if possible, as these lead to an increase of microorganisms if incorrectly applied. If needed, the system must be thoroughly dried before commissioning. Other problems, such as leaks on to the ceilings


Table 5. Cleaning methods. Most common methods Hand Vacuuming Rotary brushing


or the presence of corrosive chemicals, could damage other adjacent services. NAAD-21 Table 5 explains cleaning methods:


All cleaning reports should contain


post-cleaning testing via the same UKAS method as highlighted in the pre-clean. All pre- and post-clean information should be recorded in clear, concise, photographic reports, incorporating laboratory analysis certificates and any agreed out-of-scope areas.


Conclusion Ventilation hygiene is critical for the health and wellbeing of all persons within hospitals. Due to the elevated risks and the vulnerability of individuals that are in hospitals, the key factor is having Ventilation hygiene assessments as part of


Description of method The most common using a high efficiency filtered vacuum unit, with appropriate attachments.


With reversing directional brush machine pneumatic or electrical powered. Using an assortment of brushes and in all cases the use of a negative air machine (air mover) with appropriate filtration.


Air lance


A flexible airline with attached gun and regulator, to lower or increase pressure, to clean off delicate areas i.e. linings or increased pressure to dislodge build-up of dust in difficult areas should be used with negative air machine (air mover).


Air whip/Skipper balls


Can be several multi tubes of a nozzle or a faced nozzle with multipool predrilled holes angled to drive air whip and lead down the duct, dislodging the dust. Must be used with a negative air machine (air mover).


Hand wiping


Either in the dry form using lint free or a form of antistatic dust cloths. Some cleaning agents can be sprayed on to the duct to assist cleaning on stubborn areas providing all COSHH standards are applied.


Hand brushing/Sweeping 58 Used mainly on very large ducts and then debris bagged for collection and disposal. IFHE DIGEST 2023


conducted by third party accredited companies, with NVQ qualified technicians, utilising UKAS laboratories and detailed photographic evidence- based reporting, this will push higher standards, cleaner hospital environments, and better health and wellbeing within hospitals.


IFHE


References l NAAD-21 Guidance Document for Ventilation Hygiene:


l Part 1 GREASE (Kitchen Extract) - Legal Standards and Guidance applicable to the risk management of the fire and grease levels within commercial kitchen extract systems to EC852:2004.


l Part 2 AIR (Indoor Air Quality) – Regulation guidance standards for Indoor Air Quality in occupied zones.


l Printed January 2022 and launched Feb 2022 authored by members of NAADUK.


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97