105.The mortgagor covenants with the mortgagee that all erections, buildings, machinery, plant, and improvements whatsoever, including furnaces, boilers, water heaters and all plumbing, air conditioning, ventilating and heating equipment, electric light fixtures, window blinds, storm windows and storm doors, window screens and screen doors, and all apparatus and equipment appurtenant thereto, which are now or which shall hereafter be put upon the lands and premises, are or shall thereafter be deemed to be fixtures and a part of the lands, even though not attached otherwise than by their own weight.