Weather proof air grille

Supply Air grille cutting off the air exchanging between indoors and outdoors,the grille can prevent air outdoor flow into the r

Supply air grille(HVAC,Air grille ,Air diffuser,Air register,air vent,air louver)F-DB-L Saggy grille uses for expeling exhaust air from a air-conditioning room in positive pressure. Under normal circumstances, the blades sag naturally for gravity, cutting off the air exchanging between indoors and outdoors; The air indoor will blow open the grille when indoor pressure is bigger than outdoor. Meanwhile, the grille can prevent air outdoor flow into the room even when the outdoor pressure bigger than indoor. We have two models(A/B) products for your choice, please specify when you order.

Standard Size(mm) as bellow :

SPEC   (NECK SIZE)

200

250

300

350

400

450

500

600

700

800

900

1000

100

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150

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200

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250

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300

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350

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400

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450

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500

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600

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700

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800

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900

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1000

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