Ventilator based on negative pressure principle

The utility model relates to a ventilator based on negative pressure principle, by two dormer posts, a door type roof beam, two cantilever beam and two skeletons that the stand is formed, through angle steel fixed connection, the interval is that 3m, 6m vary between skeleton and the skeleton door type roof beam top connect various steel sheet through the purlin the stand outside connect the plane skylight through the purlin, forming waterproof, daylighting has, ventilation function's ventilator structure. Dormer support connnection in steelframe roof beam, the steelframe roof beam on set up purlin and roof boarding. The dormer post with the juncture of roof boarding sets up the flashing board, the flashing board pass through the purlin connect in the dormer post. The lower extreme of stand passes through the thick interface board of the fixed 5mm of purlin, under the wind loading, plane skylight, the thick interface board of 5mm and roof boarding formation forms the negative pressure in going along with sb. To guard him the region for room air, outdoor air form the mobile circulation of air, and the more traditional ventilator of ventilation effect is better.