Quick Installation approach: Standard 7.3cm opening fits most ventilation systems; includes clear instructions for straightforward setup requiring denial additional equipment or professional skills Versatile Air Circulation Solution: This round ceiling vent cover set includes two pieces, suitable for various spaces like homes, offices and shops; features 7.3cm installation size for air movement Better Indoor mood: Designed with straight, moving or tilted vanes to optimize air renewal, helping reduce humidity and unpleasant odors for more pleasant living or working spaces Strong ABS Construction: Built using sturdy ABS composition for extended service in indoor / outdoor locations including kitchens or living rooms while preserving visual appeal Various Design picks: Available in four distinct patterns ( straight sail, disc, moving and tilted sail) to complement different interior aesthetics from modern simple to vintage inspired appearances, Manufacturer: TQUXNGA