Fabricated elbow 90 Degree/duct elbow
entilation fittings
1. quick assembly
2. factory fitted seal with no loose fittings
3. can be twisted and adjusted, but has no effect on the gas tighteness
4. installation without sealant or solvents
5. can be used in all kinds of climates
6. the gas tighteness can keep good from 5000 Pa negtive pressure to 3000 Pa positive pressure
7. both ends of the fittings are disposed with the process of turnup, which makes both ends smooth, reinforced
and also underformed.