I have a turbine vent, known as a whirlybird, along with other regular vents on my rooftop. The Whirlybird has recently been squealing/squeaking and echoes inside the house as well as the outside to the neighbours. It is VERY annoying. I requested estimates but only two companies responded. The first came and I did not find them professional at all and did not proceed. Tactical responded and when Afshin did his inspection he found another issue with one of the other vents. An animal had chewed a hole through it. I had a good feeling with him, so he replaced the whirlybird with a non-turbine version (which I didn't even know was an option but appreciated so it will never squeak again) and he also replaced the damaged vent. Very professional, clean courteous and timely. I would highly recommend.