Double Vent
Double Vent

Screen on outside

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Airvent
Airvent
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DV with sleeve
DV with sleeve
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hopper
hopper
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VENTS            Air vents :  have screens  on the outside and  a door  that opens on inside

                                                       Dryer vents:  are used for exhaust purpose with louvers on outside

                                                    Hoppers  :  are used for a fire  escape  and can also be used for ventilation