Quick and professional response to our enquiry about installing a radon fan following an independent test that showed that action needed taking. Martin talked us through what we needed and we worked out the position with photos. Installation followed within a couple of weeks which was quick and done tidily. The fan does sound a bit louder than expected but worth it for peace of mind. The subsequent test provided by A1Radon has shown a remarkable drop in radon in the house which is a relief as I had been previously diagnosed with lung cancer and now feel safer. Other firms contacted either failed to reply or gave misleading information. I would definitely recommend.