Laminar Flow
The reality is that If theatres use forced air machines to warm patients then we are operating in turbulent flow, and not laminar flow.
Here’s a paper:
Here's a video, watch with HD settings:
I think it’s important not to throw the baby out with the bathwater. The air in functioning laminar flow is pristine.
 We are presenting results at British trauma society in Stoke on Trent next month.  It was a study using hes data looking at all trauma operations and subsequent coded infections.  We looked at hemiarthroasty as a seperate group to cross check and looked at the effect on infection rate in hospitals that changed trauma operations from plenium to laminar flow theatres.  
No reduction in infection by changing and the lowest infection rate in those hospitals that were conventional plenium and stayed that way - I'm guessing because they knew they had a low infection rate so didn't bother to change rather than any ill effect of laminar flow.

On 27 Sep 2015, at 22:07, "'Henman, Philip' [orthodirectors]" <> wrote:

  I’m with Mark.  I have looked hard and never found any true evidence that laminar flow makes a difference.  Spent a few happy infection-free years in a vascular theatre with no space constraints and without the appalling white noise.  I suspect it’s a scam……
 We had exactly the same height constraints in Rotherham (ceiling 2400mm, base at 1970mm). We put 2 in 4 years ago. Canopy works well, even with 2 consultants that are over 6 foot 3 \90they complain a little but there have been no problems/issues). Remember that the lights can be raised above their base so they will always be higher than 1970 mm.
 Ian C
Director for Surgery
Consultant Orthopaedic Surgeon
Mark, can you send me details. We are still doing all our joints in non laminar flow and only have one laminar flow theatre in which we do trauma!! I also agree about retro fits, and the cost can be near to the cost of a new build theatre....
            BW Phil Housden
On 18 Sep 2015, at 13:52PM, Mark Loeffler [orthodirectors] wrote:
Have done some research on this which has been submitted.  Long and short if it, hospitals doing trauma surgery in non laminar flow theatres have a lower infection rate than those that do.  Switching to laminar flow does not reduce infection rate.