Aldes AIRLET™ TL98 manually adjustable fresh air inlet incorporates a unique, variable, precision control damper that provides superior comfort control. The damper is manually adjusted using a discreet slide control accessible from behind the front cover, which prevents unwanted tampering. The interior grille is both attractive and multi-functional. The slightly arched grille face and horizontal lower slot take advantage of air currents to provide condensation protection. The superior air distribution pattern ensures draft-free performance. Every AIRLET™ TL98 includes an expandable wall sleeve, an exterior louver and a permanent, washable filter that is easily accessible for cleaning. The white color blends well with any decor and the unit can be cleaned with a damp cloth. Pollen filters and sound absorbing wall sleeves are also available.