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Hi, I'm working for a charity which has a door-entry system, a Fermax 4+N and video system. I've learned that the company which manufactured the module we need replaced is out of business and spares are not available, so I either have to repair or workaround the fault on the existing module, or...

Hi, I've got an outside boiler in a small brink enclosure. It has a short open flue. I've heard that if a balanced flue is used, the hot exhaust gas warms up the incoming air, acting like a heat exchanger, increasing boiler efficiency. Is this correct? If so, what is the maximum length that...