Lijan Greentech Manufactures and Supply Roof Ventilator Fans. Roof Ventilator Fans Work as Exhaust Fan in the Roof and Helps to Keep Fresh Air inside Buildings. Exhaust of Hot, Humid, Damp and Moist Air from Building Ensures Freshness. In addition to the above Smoke, Bad Smell, Chemical Gas, Steam etc can be Exhausted using Roof Ventilator Fans. Lijan Greentech Offers Different Types of Fans to Meet Requirements of Customers. We have Artith Aluminium Ventilator Fans which is Heavy Duty having 5 years Warranty. Normal Fans of Aluminium and Stainless Steel are also Good and Efficient having 1 year Warranty. Lijan Greentech Install Fans Straight Ensuring Less Wear and Tear in Service.