turnanburn'
Thanks very much for the lead. Hope I can find the outlet that stocks the material.
freightdog 188;
I agree about the path of airconditioner air but how else to explain that the dust is worse, much worse when the room single window unit is switched on? There is a construction site less than one kilometre away so you may be correct in your analysis of the cause of the problem. Best to you both.
O.P.