Archived posting to the Leica Users Group, 2001/05/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- ------Original Message------ From: Henning Wulff <henningw@archiphoto.com> To: leica-users@mejac.palo-alto.ca.us Sent: May 17, 2001 5:08:27 PM GMT Subject: [Leica] Black tape types (flavours not considered) >>> Duct tape is for sealing air handling _ducts_. No more, no less. There are various qualities, surface treatments and adhesives, depending on the type of ducts, joint stability, temperature range, insulated/non-insulated or whatever. In my architectural practice I've inspected many duct installations and seen many types of tape. They are specified by manufacturer and type/number. Most are unsuitable for anything photographic, and are usually gray, silver or white. Usually 2", sometimes wider or narrower. <<< Duct tape is also unsuitable for sealing ducts. The failure rate is 100% in just a few years. Failed ducts in residential construction is a significant source of energy waste, and with blackouts likely here in California this summer unless energy consumption is reduced, using duct tape to seal ducts is a NO-NO!! For those who question my credentials or knowledge in this area, I work for the state's Energy Commission in the residential efficiency standards office, and my 9-5 work is writing efficiency standards compliance software. I don't have the source of the 100% failure rate claim at my fingertips but I believe it's based on Mark Modera's work at Lawrence Berkeley Laboratory. Let's keep this thread short. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com