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hi there got a problem with cctv system, got 4 cameras two of which wireless through transmit kits. The two cameras and two recievers are fed into a 4ch passive balun over cat 5. At the other end three of the 4 feeds from the balun work perfectly on the dvr, however when i plug the other in...

Hi, wondering if someone could clear this up for me. Do you have to be gas safe registered to alter a flue on a boiler? it would be done correctly taking all the correction factors into account ie. length, any elbows, correct baffles etc.