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Then $75 per month. Complete digital access to quality FT journalism on any device. Cancel anytime during your trial.。关于这个话题，夫子提供了深入分析
"A lot of stately homes will have that system," says Niki Johnson, fire systems technical adviser for the UK Fire Association, a trade body, and owner of fire detection firm Derventio Fire and Security. "You could be looking at £3-4,000 just to do a corridor." Such installations require substantial pipework, he explains.