Usage Tips:our package includes 2 non power roof ventilats, each with a hoop; The vent connection size details to about 4.33 inches/ 11 cm in diameter 7.48 inches/19 cm in height; It ensures quick proficient release of roof air in just a matter of minutes while securing your space against rain moisture the non power roof ventilat is exclusively constructed with the quality 201 stainless steel, assuring you of its sturdiness; The material does not only resist rust but endures high temperatures as well, perfect f challenging weather conditions our non power roof ventilat does not require any electricity to operate; Instead, it automatically exhausts air throughout the day; Avoid extra expenses the wry of sht circuits with this energy conservation solution that offers continuous noiseless operation the ventilat comes with a tube diameter of about 4.33 inches/ 11cm a turbine diameter of about 7.48 inches/ 19cm; Its perfect size assures quick efficient air release while keeping your space free of moisture stale air this ventilat is your reliable companion f residential use light commercial applications; It's perfect f spaces like facties, farms, production wkshops, kitchens, roofs, houses; The easy air flow makes it a suitable choice f chimneys not frequently applied, ensuring a comftable environment Despite requiring no electricity f operation, the ventilat assures quick air release in minutes. Reliable efficient, the ventilat secures your surroundings against rain excess moisture. Enjoy silent operation with our non power roof ventilat. Its seamless operations quick air ventilation without creating excessive noise. Made from quality Stainless Steel, you can rely on its rustproof heat resistant capacity to provide years of efficient service. Size: Tube diameter: about 4.33 inches/ 11 cm Turbine diameter: about 7.48 inches/ 19 cm Height: about 7.48 inches/19 cm Colour:Silver Material:Stainless steel Package Contents: 1 set x roof vents f houses Only the above package content, other products are not included. Note: Light reflection different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.