A crystal puller for growing monocrystalline silicon ingots according to the Czochralski method which are devoid of agglomerated intrinsic point defects over a substantial portion of the radius of the ingot comprises a housing defining an interior having a lower growth chamber and an upper pull chamber. At least one stud mount is secured about the reinforcing rod by way of a mounting head and is opened to the ground-engaging side of the track to receive a traction stud. The composition possesses antiviral effective, namely, inhibition of influenza virus, parainfluenza virus, herpes I virus and herpes II virus. At least one duct opening is defined in the duct member for supplementing air flow to the radiator from the underside opening.