Popular product ventilation fan,butterfly cone fan,heating maching,air inlet

FC-3 Air inlet(Gravity open type)
Air door is opened under gravity, and closed under cord control. No need spring. 
The draw cord is designed on the top of air inlet: Pull the cord to close the air door, and release the cord to open the air door.
The back of air inlet can be equipped with net or light trap as per customer’s requirement which are fixed on the air inlet by bolts&nuts.
PrveDJF series Centrifugal Push-Pull Exhaust Fan ( Double Rotational Hammer)       NextFC-1 Air inlet

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