Intertherm Sloped Roof Flashing Ventilaire IV Powered / Sloped Vent Kit 3/12. VentilAire IV is an efficient way to introduce outdoor freshness to interior environments while removing stale humid air from the home. It works in conjunction with the furnace blower and existing duct system and is able to work independently when the heating and cooling system is off. Best of all VentilAire is a cost effective way to substantially improve air quality and help control attic condensation in manufactured homes. The attic ventilator is a power ventilator which automatically provides attic ventilation to reduce winter condensation and summer heat build up in the attic. To control condensation the ventilator operates at relative humidity levels above 40 percent and temperatures above 35F. To control heat build-up the ventilator operates at temperature above 110F. Features of Intertherm 914229B Sloped Roof Flashing Ventilaire IV Powered / Sloped Vent Kit 3/12 When moisture-producing activities (cooking bathing etc.) are occurring operate exhaust fans. Avoid hanging clothes to dry within your manufactured home. Vent all fuel burning appliances. Avoid using humidifiers. Avoid having large quantities of houseplants pools of water and other moisture-producing conditions. Package Contents: Intertherm 914229B Sloped Roof Flashing Ventilaire IV Powered / Sloped Vent Kit 3/12 Intertherm 914229B: Sloped Roof Flashing Ventilaire IV Powered / Sloped Vent Kit 3/12