replace all the existing rooftop pipes chimneys vertical ducts the current pipes are incorrect and must be completely removed they must match exactly the pipes shown in reference image 3 specifications number 4 pipes per side 8 total if both sides are visible shape thin cylindrical perfectly vertical color dark grey anthracite height taller and more slender than the current ones position aligned in a straight row along the roof ridge base clean and minimal roof penetration no bulky square bases or large box volumes remove the existing pipes entirely and recreate them exactly like in reference image 3 matching proportions spacing and style do not modify any other part of the building
