air louver

HVAC Manufacturer ventilation Aluminum air vent Shutter fresh air Gravity Louver GL-A&AH

Ventilation gravity louvers are mainly used for automatic exhaust of air-conditioned rooms with positive pressure.

Product Specification:
  • Product name : Gravity louver
  • Material : Aluminum
  • Shape : Rectangular
  • Color : Wihte
  • Size : Customized
  • Finished : Powder coated
  • Accessories : Oppose Blade Damper Optional
  • Installation : Ceiling/wall mounted |`
Product Details

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  • Frame: High quality extruded aluminum alloy(A6063) profile
  • Blades: High quality extruded aluminum alloy(A6063) profile



  • Fresh air louver is composed of frame and horizontal blades assembly, manufactured from high quality extruded aluminum profiled construction with advantages of corrosion resistance and rigidity.
  • This type of air vent is incorporated with a set of louver blades. It iscommonly used as exhausted outlet and ventilation on the exterior walls of washrooms, kitchens, warehouses, houses,apartments,condominiums, gymnasiums...ect.
  • Here are inverted spring hooks located on the neck, which are used to secure the device onto the wall or duct.


Surface Finish:

  • Powder coated color finish as per RAL color
  • standard color: RAL9016, 9010
  • Natural anodized aluminum finish


Material thickness:

  • Standard 1.0mm



  • Any size available
  • Overall face size = Neck size + 55mm
Item code Neck size(mm) Face size(mm)
GL-A 200x200 255x255
GL-A 300x200 355x255
GL-A 400x200 455x255
GL-A 500x300 555x355
GL-A 600x300 655x355



  • The aluminum gravity louver GL-AH is a wall mounted device that is composed of a set of horizontally mounted blades that are normally closed and are free to rotate around their horizontal axis.
  • This louver serves as a non-return damper and can be used at the exit terminal of exhaust ducts and fans.
  • A certain pressure is usually required before the damper opens to expel the exhaust air,which ensures the elimination of back flow.
  • The blades are made from light weight aluminium sheets while the frame is made from extruded aluminium.


  • Any size available
  • Overall face size = Neck size + 55mm
Item code Neck size(mm) Face size(mm)
GL-AH 800x800 855x855


hvac grilles and diffusers

vairtech factory

   Foshan Vairtech Ventilation Co., Ltd. is the leading manufacturer of ventilation products & air conditioning diffusers and accessories with more than 20 years experience. Now Vairtech is one of leading brands in China.Our company is located in the aluminum hometown of China, Nanhai,Foshan, Guangdong, which enjoys the transportation and raw material convenience.

ventilation company

   We are engaged in R&D of our products, air diffusers, air grilles, air vents, air dampers, flexible ducts, access panels and so on. Now, our products are well sold to more than 150 countries with praise for the great structures, various styles, nice appearance and high quality.

   To meet the new age of globalization, we accelerate the pace of development to make more new products and provide better service to our customers. "Customer first, Quality first"-we are sincerely welcome you to contact us for business.

ventilation system

hvac system

  We started to participate in different exhibitions in 2016, and until now, we still insist on participating in exhibitions.

  On the one hand, to let more people know our brand Vairtech, so that Vairtech has more opportunities to show; On the other hand, face-to-face communication can deepen customers' understanding of Vairtech.At the same time, customers can directly contact our products and have a certain cognition of the quality and service of our HVAC ventilation products.

ac grilles

ac diffuser

   To date, Vairtech has exported many ventilation products to more than 150 countries and received a lot of feedback from our customers. As shown in the following figure, slots diffuser, disk valve and other feedback. In fact, not only products, our salesman's service is also appreciated by customers.
   Of course, if you receive the product you are not satisfied with the place, welcome to contact us,we will try our best to solve for you. Thank you for your trust and support. I hope we can have a good cooperation opportunity to start.

ac linear vents

linear diffuser ac

According to Vairtech products, you can choose different packaging methods:

  • Internal pvc separate packaging.
  • Outer strong carton packing.
  • Additional pallets and wooden cases are optional.
  • If necessary, special packing can be used.

For specific requirements, please contact the salesman.   

linear air conditioning grilles

linear ventilation grilles

Q:Are you a manufacturer or trading company?

We are professional manufacturer in China,and have been in this field for 20+ years.   
We have professional staff, experienced designers and responsible inspectors to serve you, hoping to achieve a win-win situation.


Q:What products do you mainly produce?

A: We are focus on producing hvac ventilation air grilles, ceiling air diffusers, air vent covers, air dampers & accessories, flexible ducts, access panels,air conditioning accessories and so on.


Q: I have a project, but I don't know which product is suitable, can you recommend for me?

A: You can send the drawings to us, we have professional engineers to answer your questions and recommend suitable products.  We have one-stop procurement, please feel free to send your requirements to us.


Q:Can you change the design of this product?

A: Of course,you need to provide more pictures and information to us as much as possible.  We have
experienced designers who are specially responsible for it, and can perfectly restore the design you want.


Q:I like this product very much, but the freight is too high.What's the solution?  

  • A: If you have a forwarder in China, we can ship the goods to your forwarder.
  • A: If you buy other products from other companies in China, you can share the container with our products.
  • A: It is more cost-effective to buy in bulk.  If you are worried about the quality, you can place a sample order first.


Q:How can I get a quotation from you ?

A:You can leave us a message and we will reply to each of your messages as soon as possible. Thank you for your waiting and support. You can also find our contact information on the contact page.


Technical Support: Magic Lamp