Biddle AHU filter unit in W407 rooftop plant room, 24 Sep 2011. The filters in here had a V shape, presumably to increase the surface area of the filtration surface.
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See full size image Caption: AHU filter unit in W407 rooftop plant room, 24 Sep 2011 Description: Biddle AHU filter unit in W407 rooftop plant room, 24 Sep 2011. The filters in here had a V shape, presumably to increase the surface area of the filtration surface. Alt text: AHU filter unit in W407 rooftop plant room, 24 Sep 2011 Image credit: Team Urbex - ATF Photo subject date: 24/09/2011 |