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Hi Lalith,
If you look at the note to the Table via the link it notes:
” Values apply to an empty room with no aerosol-generating source. With a person present and generating aerosol, this table would not apply. Other equations are available that include a constant generating source. However, certain diseases (e.g., infectious tuberculosis) are not likely to be aerosolized at a constant rate. The times given assume perfect mixing of the air within the space (i.e., mixing factor = 1). However, perfect mixing usually does not occur. Removal times will be longer in rooms or areas with imperfect mixing or air stagnation.213 Caution should be exercised in using this table in such situations. For booths or other local ventilation enclosures, manufacturers instructions should be consulted. ”
In other words, the CDC recognise that this is not a perfect guide applicable to all circumstances, thus reader / user beware.
However in the context of an Operating Room, one would presume HEPA Filters and compliance with AS1668.2 in an Australian health facility.
Kind Regards
Terry McAuley
Director
MSc Medical Device Decontamination
PO BOX 2249, Greenvale, VIC Australia 3059
Mobile: +61 (0)438 109 692
Email: terry@steamconsulting.com.au
Website: http://www.steamconsulting.com.au
I endeavour to achieve a sensible work-life balance: There is no need to reply to this email from you outside of your normal working hours. Please expect the same from me.
CONFIDENTIAL COMMUNICATION: The information contained in this message may contain confidential information intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or duplication of this transmission is strictly prohibited. If you have received this communication in error, please notify us by telephone or email immediately and return the original message to us or destroy all printed and electronic copies. Nothing in this transmissionconstitutes an agreement of any kind unless otherwise expressly indicated.
—–Original Message—–
From: ACIPC Infexion Connexion On Behalf Of Lalith Ramachandra
Sent: Tuesday, November 3, 2020 2:47 PM
To: ACIPCLIST@ACIPC.ORG.AU
Subject: Re: [ACIPC_Infexion_Connexion] Covid cleaning post rest time
Gday Terry
Does it depend just on the air changes per hour or also on the fresh air rate (purge ventilation) and the filtration efficiency i e having HEPA filters etc?
I have seen this equation/table being applied to other areas with lesser quality filters and smaller percentage of fresh air.
Would appreciate your thoughts.
Cheers
Lalith Ramachandra
Mechanical Engineer, LR Consulting Engineers, Darwin, NT
Sent from LR Consulting Engineers
> On 3 Nov 2020, at 11:37 am, Terry wrote:
>
> Hi Tracey,
>
> The resting time for the OR is based on the number of air exchanges according to the following table B.1 derived from the CDC and referenced in several state based guidance documents. Link to page here https://www.cdc.gov/infectioncontrol/guidelines/environmental/appendix/air.html
>
> In essence a 99% removal efficiency is achieved in an OR with 20 air changes per hour in 14 minutes or 99.9% removal efficiency in 21 minutes.
>
> Kind Regards
> Terry McAuley
> Director
> MSc Medical Device Decontamination
>
> PO BOX 2249, Greenvale, VIC Australia 3059
> Mobile: +61 (0)438 109 692
> Email: terry@steamconsulting.com.au
> Website: http://www.steamconsulting.com.au
>
>
>
>
> I endeavour to achieve a sensible work-life balance: There is no need to reply to this email from you outside of your normal working hours. Please expect the same from me.
>
>
> CONFIDENTIAL COMMUNICATION: The information contained in this message may contain confidential information intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or duplication of this transmission is strictly prohibited. If you have received this communication in error, please notify us by telephone or email immediately and return the original message to us or destroy all printed and electronic copies. Nothing in this transmission constitutes an agreement of any kind unless otherwise expressly indicated.
>
> —–Original Message—–
> From: ACIPC Infexion Connexion On Behalf Of Michael Wishart
> Sent: Tuesday, November 3, 2020 11:01 AM
> To: ACIPCLIST@ACIPC.ORG.AU
> Subject: [ACIPC_Infexion_Connexion] Covid cleaning post rest time
>
> [Posted on behalf of member – Moderator]
>
> Reviewing our covid set up for theatre and if there needs to be a rest time post cleaning.
> Originally I believe the theatre was to be rested for 1 hour ?
> Looking for current literature and on what evidence it was changed.
>
> Thanks in advance Tracey
>
> Tracey Jones
> CNC Operating theatre
> The Townsville University Hospital.
>
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MESSAGES POSTED TO THIS LIST ARE SOLELY THE OPINION OF THE AUTHOR, AND DO NOT REPRESENT THE OPINION OF ACIPC.
The use of trade/product/commercial brand names through the list is discouraged by ACIPC. If you wish to discuss specific reference to products or services by brand or commercial names, please do this outside the list.
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